oh.. my..gawd.. Deathvalley is leading? WHY!?! Personally the impression from the community i'd been getting about DV was that it was the worst of the bunch, also since I see servers typically empty out when DV comes up to play too.. (XI excluded because anyone will play anything on THAT server)

But yeah, Deathvalley+Sandblasted =
BIG - OPEN - SPACES and MAN I have certainly had enough of that., played those so...much...so...much.. I'd sooner play Inferno even at this point.
Personally Kagoshima is currently my biggest Fav right now (my personal and sincerest thanks goes out to the designer of Kagoshima!) but here is why, the complexity of the map keeps the game very interesting ( I LOVE it when JJ's can be used for something other than Poptarting!) and while still maintaining that no asset type is excluded from play. You pretty much won't ever see any of those ~Every Mech Rally HERE~ things when there is the whole rest of the map that can be used but doesn't. (Also I love the blend of theme and interesting little map secrets I find~)
After that I totally favor Extremity because...well...its a friggen asteroid hurdling through space... and if thats not good enough you can suck it! XD
I also tend to think of Maps as being Novice, Intermediate, and Expert difficulty even if they aren't supposed to be thought of like that, but anyway, my interests tend to gravitate towards Expert types (and yeah, that even includes Inferno) that actually allows, no, forces the players to be creative and think. Use them brains people, work it!