Its a good game. I personally like how you have to work hard to level up.
I would recommend getting it

I think it is worth buying, I am enjoying it so far.
I barely seem to rage on this game, compared to BO2, they took a lot of BS out like death streaks and noob tubes, the guns are really good, the AR's are best in the game, but the SMGs are alright aswell, you just need to use them on smaller maps.

The only 2 problems with it in my opinion are that the maps are too big and ranking up takes long.

There are so many mixed reviews for the game and I don't want to be the one to tell you to buy a game that you may not like.

I would rent the game or find a way to play it before purchasing it.

I have heard people love it and I have heard the exact opposite.

Of course it is, every game has its reason to play and the reason to play cod is A you like campaign or B you're good at multiplayer.