If you are just playing the campaign then the story is short and would have limited interest for replaying repeatedly. It's not bad, lots of interesting weapons and the enemies are fairly challenging for a casual player.
the only reason that I gave this game such a low rating was because I couldn't play very much of it don't know what it was but the game would lock up at the same point no matter what I tried so beware of renting this game
The campaign was enjoyable, some great stuff they've thought of.
Its important to know it cost money to play online multiplayer. (which i didn't)
But if you like campaigns or shooters then you should give this game a look.