There's nothing better than using a gun that manipulates gravity to take mutant/zombie/human/whatever out with in multiple different ways and forms by being able to manipulate a large number of objects in the games world.
Since it doesn't have multiplayer I'd recommend anyone to borrow it or rent it first because all it's got is its single player, which isn't that long. The game is also very linear.
This game does have vehicles, a number of different weapons, no customization whatsoever though.