So after reading the reviews it sounds like I'm going to absolutely LOVE this game.
Infamous 1 and 2 were some of my favorite games on PS3, so much so that I platinumed Infamous 1, and its not often I go for a Plat trophy.
So as others have said sounds like if you were a big fan of the first 2 you'll be all over this. If you didn't like the other 2 then it might not be for you.