The lights are on
The online community isn't as good as LIVE, but it is decent.
Demon's Souls is a really hard RPG, you might like that; Fallout 3 if you didn't get it on PC, cause it's better on PC; I don't know about any other RPGs cause I don't play many, but there are alot that are on both PS3 and PC, so I guess if you don't want it on PC, you could get it on PS3.
If you like any kind of action game, then Uncharted 2: Among Thieves would be a must have; inFamous might seem cool to you; Some games get bonus/ exclusive content on PS3, so you shold checkl it out (I.e. Assassins Creed 2 / AC: Bloodlines, Resistence 2 / R: Retribution, Batman : Arkham Asylum, etc.)