co-op multiplayer games for the ps2

Game	Players	Score	Genre	Release Date *	Notes
Mercenaries 2: World in Flames	Multi	xx	Action, Adventure, Third-Person Shooter	November 1, 2007	search terms
Spider-Man: Friend or Foe	2	62	Action	November 1, 2007	search terms
Power Rangers: Super Legends	2	xx	Action	October 30, 2007	search terms
Looney Tunes: Acme Arsenal	2	38	Action, Adventure	October 9, 2007	search terms
Crash of the Titans	2	70	Action, Adventure	October 2, 2007	search terms
Naruto: Uzumaki Chronicles 2	2	49	Fighting, Action	September 1, 2007	search terms
Fantastic Four: Rise of the Silver Surfer	4	36	Third-Person Action, Adventure	June 15, 2007	search terms
Samurai Warriors 2 Empires	4	55	Third-Person Action, Beat-'Em-Up, Strategy	February 27, 2007	search terms
Eragon	2	51	Action, Adventure	November 14, 2006	search terms
Delta Force - Black Hawk Down: Team Sabre	32	48	Third-Person Shooter	November 7, 2006	search terms
Guitar Hero II	2	92	Music	November 7, 2006	search terms
Destroy All Humans! 2	2	74	Third-Person Action, Adventure	November 1, 2006	search terms
Justice League Heroes	2	68	Action, Role-Playing Game	November 1, 2006	search terms
Marvel: Ultimate Alliance	4	81	Action, Role-Playing Game	November 1, 2006	search terms
SOCOM: U.S. Navy SEALs Combined Assault	32	72	Third-Person Shooter	November 1, 2006	search terms
Snoopy vs. the Red Baron	4	73	Flight Action	October 1, 2006	search terms
Greg Hastings' Tournament Paintball MAX'D	8	70	Sports	September 26, 2006	search terms
Samurai Warriors 2	4	58	Third-Person Action, Beat-'Em-Up	September 19, 2006	search terms
Barnyard	4	62	Adventure	August 1, 2006	search terms
ZooCube	4	xx	Puzzle	July 21, 2006	confirmed
America's Army: Rise of a Soldier	16	71	First-Person Shooter, Action	June 27, 2006	search terms
Rogue Trooper	4	71	Third-Person Action	May 23, 2006	search terms
Over the Hedge	1	58	Action, Platform	May 9, 2006	confirmed
Dynasty Warriors 5: Empires	2	62	Action	March 28, 2006	search terms
Full Spectrum Warrior: Ten Hammers	2	71	Third-Person Action, Real-Time Strategy, Simulation	March 28, 2006	search terms
Final Fight: Streetwise	2	43	Action, Fighting	February 28, 2006	search terms
Gauntlet: Seven Sorrows	4	59	Action, Role-Playing Game, Fighting	December 12, 2005	confirmed
Combat Elite: WWII Paratroopers	2	54	Third-Person Shooter, Action	November 21, 2005	search terms
Shadow the Hedgehog	2	45	Action, Platform	November 15, 2005	search terms
Harry Potter and the Goblet of Fire	3	68	Third-Person Action, Adventure	November 8, 2005	confirmed
Teenage Mutant Ninja Turtles 3: Mutant Nightmare	4	53	Action, Fighting	November 1, 2005	confirmed
Brothers in Arms: Earned in Blood	4	71	First-Person Shooter, Action	October 26, 2005	search terms
Nicktoons Unite!	4	53	Action, Adventure	October 26, 2005	confirmed
Ratchet: Deadlocked	8	81	Third-Person Shooter, Action	October 25, 2005	search terms
Sims 2, The	2	75	Simulation	October 24, 2005	confirmed
SpongeBob SquarePants: Lights, Camera, Pants!	4	59	Party	October 21, 2005	confirmed
Sniper Elite	8	76	Third-Person Shooter, Action	October 18, 2005	search terms
Tony Hawk's American Wasteland	8	77	Extreme Sports	October 18, 2005	search terms
Warriors, The	2	84	Action	October 17, 2005	search terms
Sly 3: Honor Among Thieves	2	83	Action, Adventure, Platform	September 27, 2005	search terms
We Love Katamari	2	86	Puzzle	September 20, 2005	search terms
X-Men Legends II: Rise of Apocalypse	4	82	Third-Person Action, Role-Playing Game	September 20, 2005	confirmed
Mortal Kombat: Shaolin Monks	2	77	Action, Adventure, Fighting	September 19, 2005	search terms
Tak: The Great Juju Challenge	2	74	Action, Platform	September 19, 2005	confirmed
187 Ride or Die	4	52	Racing, Driving, Car Combat, Action	August 23, 2005	search terms
Darkwatch	2	74	First-Person Shooter, Action	August 16, 2005	search terms
Fantastic Four	2	64	Third-Person Action, Adventure	June 28, 2005	confirmed
Samurai Western	2	58	Action, Adventure	June 7, 2005	search terms
Digimon World 4	4	48	Role-Playing Game	May 29, 2005	confirmed
Star Wars Episode III: Revenge of the Sith	2	60	Third-Person Action, Adventure	May 4, 2005	search terms
Resident Evil Outbreak File #2	4	58	Third-Person Action, Adventure, Survival Horror	April 26, 2005	search terms
Rise of the Kasai	2	68	Third-Person Action, Adventure	April 5, 2005	search terms
LEGO Star Wars	2	78	Third-Person Action, Adventure	March 29, 2005	confirmed
Obscure	2	65	Action, Adventure, Survival Horror	March 29, 2005	confirmed
Tom Clancy's Splinter Cell Chaos Theory	4	87	Action, Adventure	March 29, 2005	confirmed
Dragon Ball Z: Sagas	2	49	Third-Person Action, Adventure	March 22, 2005	confirmed
Shining Tears	2	61	Action, Role-Playing Game	March 22, 2005	search terms
TimeSplitters: Future Perfect	16	84	First-Person Shooter, Action	March 21, 2005	confirmed
Gran Turismo 4	6	89	Racing, Driving	February 22, 2005	search terms
Viewtiful Joe 2	2	85	Fighting, Action	December 7, 2004	search terms
Battle Assault 3 Featuring Gundam Seed	4	48	Action, Beat-'Em-Up	December 6, 2004	search terms
Tom Clancy's Ghost Recon 2	16	58	First-Person Shooter, Action	November 30, 2004	search terms
King Arthur	2	59	Third-Person Action, Adventure	November 16, 2004	confirmed
Technic Beat	2	67	Rhythm Action, Music	November 2, 2004	search terms
Teenage Mutant Ninja Turtles 2: Battle Nexus	4	47	Action, Fighting	October 19, 2004	confirmed
Conflict: Vietnam	2	58	Third-Person Shooter, Action	October 5, 2004	search terms
Dukes of Hazzard: Return of the General Lee, The	2	52	Racing, Driving, Action	September 28, 2004	search terms
Blood Will Tell	2	67	Third-Person Action	September 21, 2004	search terms
X-Men Legends	4	79	Third-Person Action, Role-Playing Game	September 21, 2004	confirmed
McFarlane's Evil Prophecy	4	34	Action, Fighting	June 15, 2004	search terms
Syphon Filter: The Omega Strain	4	65	Action, Adventure	May 4, 2004	search terms
Shrek 2	4	71	Action, Platform	May 3, 2004	confirmed
Serious Sam: Next Encounter	8	65	First-Person Shooter	April 12, 2004	confirmed
Resident Evil Outbreak	4	71	Third-Person Action, Adventure, Survival Horror	April 1, 2004	search terms
Crimson Sea 2	2	75	Third-Person Action	March 30, 2004	search terms
Tom Clancy's Rainbow Six 3	8	70	First-Person Shooter, Action	March 23, 2004	search terms
James Bond 007: Everything or Nothing	4	84	Third-Person Action	February 17, 2004	confirmed
Baldur's Gate: Dark Alliance II	2	78	Action, Role-Playing Game	January 20, 2004	confirmed
Fallout: Brotherhood of Steel	2	64	Third-Person Action, Adventure	January 13, 2004	search terms
Deer Hunter	4	xx	Sports, Hunting	December 22, 2003	search terms
Medal of Honor Rising Sun	4	68	First-Person Shooter, Action	November 11, 2003	search terms
Lord of the Rings: The Return of the King, The	2	85	Third-Person Action, Adventure	November 5, 2003	confirmed
Gladius	2	78	Role-Playing Game, Action	October 28, 2003	confirmed
SWAT: Global Strike Team	4	69	Action	October 28, 2003	search terms
Teenage Mutant Ninja Turtles	2	59	Action, Fighting	October 21, 2003	confirmed
Time Crisis 3	2	81	Light Gun, Action, Shooter	October 21, 2003	search terms
Batman: Rise of Sin Tzu	2	63	Third-Person Action	October 16, 2003	confirmed
Mega Man X7	2	58	Action	October 14, 2003	search terms
Conflict: Desert Storm II - Back to Baghdad	2	70	Third-Person Action	October 8, 2003	confirmed
Rugby 2004	4	61	Sports	September 16, 2003	search terms
Hunter: The Reckoning Wayward	2	68	Third-Person Action	September 9, 2003	search terms
Starsky & Hutch	2	60	Racing, Driving	September 9, 2003	confirmed
Summer Heat Beach Volleyball	4	65	Sports, Volleyball	June 30, 2003	search terms
Wakeboarding Unleashed Featuring Shaun Murray	2	83	Extreme Sports	June 3, 2003	search terms
Tenchu: Wrath of Heaven	2	79	Action	March 4, 2003	search terms
Battle Engine Aquila	2	73	Action	January 21, 2003	search terms
War of the Monsters	2	80	Action, Fighting	January 15, 2003	search terms
Star Wars: The Clone Wars	4	72	Action	December 11, 2002	confirmed
Mystic Heroes	4	67	Fighting, Action	November 24, 2002	confirmed
Contra: Shattered Soldier	2	78	Action, Shooter	October 22, 2002	search terms
TimeSplitters 2	16	90	First-Person Shooter, Action	October 8, 2002	confirmed
Conflict: Desert Storm	4	55	Action, Adventure	September 30, 2002	confirmed
Tribes: Aerial Assault	16	73	Action	September 24, 2002	search terms
Star Wars: Jedi Starfighter	2	81	Flight Action	March 11, 2002	search terms
Baldur's Gate: Dark Alliance	2	87	Role-Playing Game	December 3, 2001	confirmed
Dynasty Warriors 3	2	78	Action	November 26, 2001	search terms
Half-Life	2	87	First-Person Shooter	November 15, 2001	search terms
Adventures of Cookie & Cream, The	4	78	Action	May 1, 2001	search terms
Gauntlet: Dark Legacy	4	73	Action	May 1, 2001	confirmed
109 games

This site is built by a ugly perl script that crawls metacritic. I'm not affiliated with them in any way. I just find their layout to be clean and easy to parse, and their game database seems to be very complete. Someday, I hope to discontinue this service when a major game site treats co-op multiplayer as a searchable game feature!