They really should nerf those penalties. Perhaps making GG's lower enemies give half exp or no exp, Drac's only 1 hp per level, and TT's no gold piles spawn. MA's is fine, and Binlor's is too. EM is interesting, but I haven't tested it enough to give an opinion, and Taurog's great if you want to make sure you'll win a normal dungeon.
I speak chaos.