Its called modern warfare. Modern. Warfare. How do we fight our wars today? With snipers, grenades, team mates, and i'd hope soilders take fucking cover. The only similarity between doom and cod I'd the first person view, you can't compare the two. Its like complaining a WWII shooter doesn't have enough lasers or robots. Your not going to find demons in cod.
I hear what you're saying. But they still belong to the same genre "First person shooter" regardless of setting. They may have a slightly different setting, but at the end of the day you're still an asshole with a gun.
Just like the game previous made by the same company, "Wolfenstein 3d" only they swapped the human soldiers with demons, the premise is still the same.
Call of Duty is a modern take on the fps genre, that can't be disputed, but I feel that the features added on have been to the genres detriment, for the reasons listed above. This isn't just limited to Call of Duty, I just feel that was the best modern example.