Steam recently changed the default privacy settings for all users. This may impact tracking. Ensure your profile has the correct settings by following the guide on our forums.
My friend just got a PS3, but doesn't know what games to buy (besides MGS4). He's looking at inFAMOUS and resistance 2. He asked me my opinion but I couldn't answer due to the fact that I have a 360...
MGS4
Motor Storm: Pacific Rift
Resistance 2
Killzone 2
Uncharted
Wipeout HD
SOCOM: Confrontation (It really isn't that bad of a game now that all of the updates are out)
Warhawk
Ratchet & Clank Future: Tools of Destruction/Quest for Booty
That's really all of the exclusive games I can think of off of the top of my head right now.
Some games to look out for:
God of War III
MAG: Massive Action Game
Twisted Metal PS3
Final Fantasy Versus XIII
Ninja Gaiden Sigma 2
Uncharted 2: Among Thieves