really just a map where the only cover, is cover you cant see over so you cant shoot from behind cover. That would be the ideal map for me. Where everyone has to be moving in and out of cover to take shots so you cant sit around camping in the same spot.
Honestly, for me, most of the maps in this series have been OK. I'm going back to my PS3 days, but my all time favorite map in any game I've played is Orick from Resistance 2. Excellent for snipers, lots of close quarters, places to hide, and good choke points. Honestly, it might be a bit too big of a map for the team sizes in CoD, but it was amazing in a 60 person TDM.