well since some of you guys add their personal favorites here, i'll add some too.
- Eternal Sonata (yep a bonus one, + with the new character and dungeons, more harder that xbox360 version can do)
- Naruto Ultimate Ninja Storm (well yes, kinda fun. specially a 2player game in 3d mode. most of all its like you can do full jutsu techniques there like walking in the wall, and some splashes effects, everything is in there)
- Valkyrie Chronicles (well i got a japanese one, sorry. But anyway, its still the same franchise game in US. The game is kind fun, Realtime Strategy, almost all of my party are girls in there. dunno why)
- FF13 (not so impressive, but the CG is good. Or maybe i rather buy a BD movie for this. Its 75% CG movies with 25% gameplay, huh)
- Tales of Vesperia (?)
- DMC4 (i just love this game)
- Franchise games of Motor Storm in PS3 (currently there are 2, i love ramming vehicles while you race, lol)
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there are some PSN games that is good:
- Crystal Defenders (epic game)
- Fat Princess
- Mortal Combat (PSOne Classic)
- Final Fantasy VII,VIII,IX (PSOne Classic)
- Tekken DR
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btw: Naruto Ultimate Ninja Storm is really a good game. Dunno on MW2 which is im not really fond with 1st person games, an i suck on analog sticks as a point for the gun..