There is no "best" PS3 game out there, but the ones with the highest ratings that I recommend are as follows:
Assassin's Creed: known for it's amazing graphics, extensive world, and gameplay
Lair: Combat with dragons using your whole controller to steer your dragon
Mirror's Edge: Acclaimed as "The most exciting first-person adventure of the year" -EGM, Winner of the Best Original Game from Game Critics 08 Award, Best of E3 2008 from IGN, Best of E3 08 from GamePro
Devil May Cry 4: The fourth in the Devil May Cry series and personal favorite of mine. Great graphis and gameplay.
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In my opinion Dead Island is the best, it depends on what you think of the game.
Battlefield Bad Company 2
NHL 2010 by Ea Sports
the ps3 is better, but if you want a family game system then the wii is the best.
my opinion resistance 2 and resident evil 5 Call of duty black ops is the best game.