I can't remember if it was on this server or another one, but before I took my ET hiatus last year, I remember Adlernest being one of my favorites. It has straight-forward objectives, and is a well laid-out map. Only problem is that it can be short with good players on attacking team. But with even players can be a whole lot of fun.
http://image.www.gametracker.com/images ... ernest.jpg