Definitely fits the bill of the overblown third part in a trilogy à la Matrix Revolutions, Pirates of the Caribbean At World's End, Dark Knight Rises etc.

Apparently in this one you play as a character who was totally present during the big events of the first two Modern Warfare games the whole time (which basically just acts as a greatest hits flashback). Weak ass storytelling.

Basically what I felt upon the game's original release - that it felt like the first COD that was just going through the motions.