Nothing really new here, nothing new to say. Let's start with single player. You played one Call of Duty single player - you played it all. Bunch of stuff exploding, constant action and crazy running, things fall apart with new badass villain. Sometimes there are actually very good designed levels which are quite amusing.
Multiplayer is a total failure. They removed the most popular two mods - DEMOLITION and HQ PRO ffs!!!!! Fast pace action is no more because maps are terrible, too large and uninteresting. It is only 6vs6 (again!) so you will spend most of the time searching for enemies. Game is full of cheaters (again!) and nobody seems to care about that. Steam, Activision, Infinity Ward - nobody. They just want to collect annual amount of money from fans.
Graphics were described as next-gen. Nothing next-gen here, it's the same old blurry disgusting textures. Sounds are really much copy pasted from previous games.
I regret i spent money on this terrible game because I expected much more. It is even worse than Modern Warfare 3. Yes, unbelievable but true.