Urrm..... I love it, depending on how much you plan to play it, the hardened edition is worth it. If you like zombies, its worth buying just for the zombies, as much as people say its not, multiplayer is really fresh and new. Great graphics, sfx, storyline. Great buy, well worth it. Strays greatly from the cookie cutter call of duty path.
~Side Note~
The multiplayer is good, but even with the "Best" lag compensation setting, it still takes a lot more bullets to kill. Definitely.