Prototype is fucking fun if you like playing around in the game environment for the fun of it and accomplishing nothing. I think half of the trick is not to treat it as a game, but more of a playground? Most of the controls are so fluid that you can sprint down a street, do a front flip over a car, grab the car as you hit the 180 mark, and toss the car into other cars/people/nature/whatever else before landing on your feet again. Grab somebody by the collar, and hurl them into a sign post to see how many pieces they end up in. Ghost-ride a helicopter into an intersection.
It's a great game if you like screwing around.
It's a great game if you like screwing around.