I just beat Infamous 2 yesterday.
It's a lot like the first game, with some tweaks to the gameplay that make it just a bit more polished and better.
I recommend anyone with a PS3 to play it, it's a fun open world game.
I have Prototype coming in from gamefly to play next. It's a few years old, but I never got around to playing it. Heard it's good, but not amazing, which sounds like a good rental to me.