My fingers seems to take the brunt of it!
I like the fact that you start the game wihout an intro or having to go to some Tutorial school or instruction section to play. From the word go you have to defend and attack. As you go along it explains to you what to do and when or how. Its also great that it gives you the keyboard command asswell as the controller commands. Offcoarse this game should only be attempted with a controller. I've hear that playing it with the keyboard leeds to lots of frustration.
Also you start the game with probably the strongest of the Superhero's. Captain America, Wolverine, Thor and Spiderman. Of the four Spiderman seems the weakest to me. It does bother me alot seeing as Spidy is my Hero of choice. As you progress through the game the characters obviously increase in strengh and combat skills. Which makes for great action sequences.
I am not into games such as this type of Arcade action, but this one i really enjoy. Xmen the game was a bit boring and i gave up after awhile. But not this one. So i suggest you get the demo or buy the game.