inFAMOUS was a great action-adventure at the time of its release. It is an arcadish mix between Grand Theft Auto and Assassin's Creed, in the sense you can explore a large city and scale buildings, only you have special powers.
The graphics, player models, and cutscenes are decent. The mechanics are good, though, and it feels like a perfect match when you are traversing the environment (which is also nice). The storyline is surprisingly intereting. There are enough side quests to keep you interested.
If you play the game now, it wil feel outdated. But don't miss out because the inFAMOUS eries is one of the must-play exculsives of this generation.