If you are a COD fanatic, you probably already bought it. You'll hate it, then love it when you get used to it.
If you are the kind of person that likes CoD, buy it. It's not a waste of money. There are so many different ways to play this game. CP, MP, Zombie, etc. There are 2-3 games in this thing. You get your monies worth.
If you are not, that's fine. It might be more interesting to you later.