Check out 1984.  Alien base locations (s1) look kinda weak, but overall the map could have some nice game play.  Above ground looks like mara heaven, and underground isn't so tight that its a dretch deathtrap for humans.

I haven't had any matches on it though, so few servers take chances with maps anymore

I like maps that have a coherent appearance, even if they don't look like the standard maps.