I think this is one of the strongest line-ups of core maps we've had in Call of Duty since the original Black Ops. I don't think there's any that truly stand out as iconic but they are all really well made and matches flow superbly. I quite like London Docks and Sainte Marie Du Mont along with Gibraltar and they feel very appropriate for COD. Jury is still out on Gustav Cannon and I can't decide if that's a shocking map or something ingenious - it does look fantastic though and something a bit different.
I'd take these over the hell that was Stonehaven, Siege, Chasm, Free Fall and every map seen in Infinite Warfare along with Black Ops 3's cartoony ones with conveniantly placed walls to run on and places to jump over. Sledgehammer have done a good job with these and that's without DrDisrespect as designer!