I hate Wasteland and Derail, they're my two least favorite maps. Both have the same problem. Either both end up with huge clusterfucks in the middle of the map, or everyone sits on the edge and snipes. Both situations are equally annoying.
The best maps are the urban ones. Karachi, Invasion, Favela, Highrise. A person can choose to be a sniper on those maps, but it's not as easy to just own a large part of the map with a single sniper. You might have one street covered, but people have other ways of getting to you. On Wasteland and Derail, a good sniper can lock down a huge portion of the map and make it almost impossible to displace them.
Edit: Here are my maps in order of favorite to least, broken in groups of maps that are very close in fun factor.
Skidrow
Invasion
Karachi
Favela
Highrise
Sub Base
Terminal
Scrapyard
Quarry
Estate
Underpass
Rundown
Afghan
Derail
Wasteland
Rust is, well, it is what it is. It's very fun every now and then because it's so chaotic, but I wouldn't want to play it often.