The game has an interesting story, campaign is fun to play thru, online part of it is completely dead, there is no one playing online and if you want to earn xp for ranks or challenges you have to do it online.
The game has a decent story line, however the controls are horrible. The gravlink is a cool tool but I found I didn't use it until it was upgraded to throw stuff. This made the game more fun. Back to the controls, because of the poor design it makes the game frustrating. I finally sent back because of the frustration.
It's not that the game is horrible (ok - the controls ARE horrible), it's just that it could have been so much better. I really hope they make a part two to this game because the who anti-gravity physics engine is pretty cool, it's just the story, controls, guns are lame. It needs a reboot.