Improves on the first in nearly every way, this game gets more fun as you go.
Story: Not too deep, but plenty to keep you going. He shot you in the ass, after all.
Sound: Explosions and gunfire sound great, but some lines are delivered way to much or poorly. Music is fitting for the situation you're in.
Graphics: A bit too bright for my tastes, but they aren't bad. Explosions look amazing, and destroying buildings is a lot of fun.
Controls: Some parts are a bit clunky, but it is very playable.
Gameplay: Some people seem to have a lot of bugs, some don't.
Multiplayer: The co-op experience is a blast. Little to no lag, and destroying things with a buddy is good fun.
I guess the experience varies from person to person. In my opinion, this game deserves a solid 8.5. It's good in every way, but not quite perfect.