I think it would be a VERY nice touch to add in the 'after-effects' of the K.E.M strike to all maps on the infected game-mode. (It gives it a dark, zombies, no-hope feeling)
If this video link doesn't work try this one : COD Ghosts - New K.E.M Strike Effect - Thoughts and Opinions? - YouTube
This is what I mean by K.E.M effect.