The gameplay is unbelievably brown, and the actual colour scheme is awful compared to games like Farcry, Halo, BF3 and so on
Far Cry, a completely unrelated game to an arcade shooter.
Halo, a Sci-Fi shooter completely unrelated to CoD as it functions completely different.
Same story with BF3, BF3 is not supposed to work how CoD works.
Do you even know how CoD is supposed to work? It doesn't need big maps like BF3 or Halo, it needs fast paced FPS gameplay to give you an arcade-shooter-like feel.