I'll post
Feudal Epic: quickly becoming one of my favorite multiplayer maps on the site, it's much better than Feudal War (which is still a good map) because you HAVE to attack, and know exactly when to attack, if you wan to win. Feudal War, because there is a back entrance to each castle, it is often a stupid idea to attack even in 1v1 (the big problem with AOR1 as well), and I hate build games, but in Epic, there is still a balance. Etween attacking and defending, it's just that attacking is always a part of the game, especially at the beginning. I also like how there are like chunks of 2 castles with 1 center (village) area, it breaks the map down nicely into 4 basically even quadrants.
American Civil War: Easily my favorite 1v1 map, I like how it is a relatively basic map with a few twists. Often on simpler maps, you want to stay out of the center, but on this the center is often the most important part (of 1v1). This is also a good 2v2 map, with often the same basic strategy as 1v1.
World 2.1: I haven't played very much i a while because I lost like 100000000 8 man games in a row after succeeding pretty well when I first started playing it, but it is still a perfect 8 man standard game map, preferably esc freestyle (when I can devote the time necessary for freestyle) but other settings work well too.
Berlin: honestly, I've only played it like 5 times, a couple 1v1's, a couple 2v2's, but I think I 'm undefeated on it, or at least close. This is a beautiful 2v2 map for sort of the same reason as I like Civil War, a relatively simple map with a nice little twist added in.
Honorable mentions:
Classic: You've just gotta love the Classics

City Mogul: I suck major a**hole at this map, but a good idea
Circus Maximus: a fun change from time to time
Small Maps (Lux, Doodle, Madagascar, Egypt: Lower, Circus): same reason as just Circus, a fun change occasionally
I think that's about it, hope I'm not forgetting any great ones