Prototype is fun, and that's the best compliment you can give any game. It's also challenging and high pace. As far as open world games go, the aspects of traveling around the city and upgrading your character are particularly well done. Any good open world game needs to be fun when you're in open roam mode causing chaos, and Prototype delivers. The characters leave something to be desired, however: they're generally one-dimensional and the voice acting is forced. Like a good action game though, the dialogue ends quickly and you can get back to the action.