very recently two super hero sandbox action games were released for the consoles. One of these games is inFamous, where you play a person granted electricity based super powers and can choose to be either good or bad. The other is Prototype where you play as a person transformed into a living biological weapon. Unlike inFamous, prototype casts you very definitely as an anti-hero and is designed around the idea of killing and absorbing civilians and enemies while fighting is crucial for staying alive.
Both games have obtained fairly good reviews and like Battleforge and Demigods, it'll be interesting to see how both new superhero franchises develop.