[quote name='ChernobylCow']
Best Undiscovered Playstation 2 games.
[/QUOTE]
That's an incredibly thorough list. A few of those titles never released in the States, but you'd be hard-pressed to find a more well organized list online.
Here are just a few I didn't see mentioned. All of these are PS2 only titles.
Persona 4 (Presuming this wasn't on there b/c of when it was written; the last great JRPG on the PS2)
Chaos Legion (The forgotten Capcom franchise amidst RE, DMC, and Onimusha)
Devil Kings (Capcom's Dynasty Warriors -- surprisingly high production values)
Extermination (First party Sony title that took us back to old RE days)
Maximo: Army of Zin (The original sold very well but this sequel got short-changed by the masses)
Rise of the Kasai (The sequel to Mark of Kri -- a better game, IMHO)
Snoopy vs. the Red Baron (Don't let the license fool you -- this was a great game)
Shining Force EXA (Not the Shining Force we played growing up, but a well polished hack and slash)
Spy Fiction (Where else will you find characters designed by renowned manga artist Renji Murata?)
Vampire Night (Easily one of the most overlooked lightgun games)
Yakuza 1 and 2 (2 is leaps and bounds better, BTW)