I can't state how much fun this game was. It was fun.
Does that do it? Okay, assuming you don't just take my word for it, this is a game where you can hijack a helicopter mid air and use it to mow down zombies. Do I really need to keep going? For me that does it, that's just bad ass enough.
But alright, the game is a totally over the top sand box game where you can slaughter almost everything around you whilst trying to figure out what happened to you. It controls pretty well and all games need to make piloting a helicopter this easily.
The story isn't great, but I did enjoy unlocking the "web of intrigue" which help tell a larger story in fairly neat flash backs. But aside from this, there's not a lot to do except for this kinda lame Olympic stylized events like hopping to the top of a Sky Scraper as fast as possible. I did them for an achievement and one side quest did finish off a little plot thread from the story, other then that they are totally useless and seem to be only added to pad to the play time. Once the game is finished, there isn't anything left to keep you playing really, unless you really, really enjoy collecting orbs.
Like screwing around in games or causing mass damage? This could be the game for you. Me and a friend of mine kept trying to top each other by doing crazy crap in t he game for hours and that was before I managed to get any cool upgrades. However once the game is done, that's it.. there's very little reason to go back to it. I would knock off another star, but I really did have fun with it and can see my self replaying it, just not anytime soon.
UPDATE:
Though I can't change my score, and don't think I would even if I could. This game is no longer in my collection, the lack of any DLC and any real side missions killed it for me. What was in the game was fun and nothing beats jacking a helicopter mid-air, but that's not enough reason for me to replay the game, especially with how annoying some missions are. It was a really fun sandbox to play in, but once you've destroyed you're castle so many times used the same shovel and pale so many times, you'll probably want to play in a different one, with newer and better toys.