I like easy to navigate maps, with lots of different routes, so there is no need for camping.
The spawnpoints should also be spread out and placed behind cover.
Also the maps shouldn't be too big, unless it's made for snipers.
I also like custom buildings, when ever I try to make a "natural" map I always end up thinking
it's to easy to just choose buildings and set them up with some details, so I wind up making the
map look more like an arena

Currently making a city map(Beirut), I'm gonna need to do my best to top the other city maps like the may potm winner.