I think I must be in a minority here when I say that ADOM is just about the only roguelike I have ever played (apart perhaps from Toejam and Earl)! I dont even really like the fantasy genre but the depth of ADOM is amazing, the quest system is great fun, there are so many different ways to die and the game doesn't take itself too seriously. I wondered if there were any other good roguelikes that I might enjoy. I had a quick look at Nethack once but got very bored after about 5 minutes.