I like all of the maps, which means I enjoy the game more, which means my opinion is best.
Huh. I thought the rule was whoever complained the most about everything had the most important opinion on the internet.
As I don't enjoy closed world FPS games of any type or style, my opinion is all these maps suck because they're played in that style. Only way to improve any of them would be to remove all the guns. (Incidentally, have played that variant on other games where all you have is melee weapons, and actually enjoyed that a bit, so clearly that's the only meritorious version of FPS map - a box where you don't get to shoot people).
(And yes, my comment is not meant to be taken seriously).