I wonder why there are so many bad reviews

I think the game (Single Player Campaign) very well. Even the story, on which are not relevant in my opinion is ok. The graphics are top notch here and there and the game runs very smooth (GTX660 Ti). The physics engine is incredibly good. Walls crumble during firing and wooden boards go unlike other titles by shelling and hand grenades broken. The sound is also very good. If you like the Call of Duty series, makes here certainly nothing wrong. I think the game is still an eating better than CoD MW3. Only the linking of Origin Account with the serial number and thus the impossibility of selling a used game is a joke and as far as I can tell, not legally knotless by the manufacturer.