Don't save the world alone!
The gameplay itself is very entertaining, a fairly simple cover system, and the easy aim and shoot combined with blind-fire made the game that more interesting. The weapons customization setup in the game is well worth the time to make as much money as possible to trick out your weapons and make the game interesting through various different combinations of guns. Speaking of the multiple combinations, that very concept is probably the best part about the game. Between you and a partner there are an infinite number of ways to take on the many bad guys, between one person pulling of brutal headshots with a sniper rifle, and the other running rampant through enemies with a sub-machine gun and shotgun, the number of ways to take out enemies and execute the game itself completely make this game a repeat shooter.
There are some other small quirks in the game that add to our amusements such as manly chest bumping, playing rock, paper, scissors, and other useless side points that make the game fun for more than one person to play.
That being said the biggest draw back to the entire game is that it is almost a complete co-op game. While it can be played alone, it is far more enjoyable to try playing with a friend on split-screen or over Live. Some of the more noteable achievements require the aid of a friend simply because the AI is not that advanced.
Another reason I did not rank this game nearly as high as it could be was at times the controls would become difficult, particularly in small areas. Trying to heal your fallen partner is not very easy in small spaces because of the A button being both the healing button and the sprint button. So instead of grabbing and healing my friend I would find myself sprinting away from him.
Overall, however, the game is an enjoyable third person shooter and is at the very least worth a rent if not a buy. The replay value speaks for itself, and the amount of time you and a friend could have changing up gameplay styles makes this well worth while and absolute fun in the midst of all the mayhem.