The first RL I came in contact with was probably Nethack, and that one looks so immensely complex that I gave it up completely after a few tries. DoomRL is much easier to get a grip on, so now maybe I can "ascend" to the more complex ones :).
DoomRL reminds me of the original Rogue in its relative simplicity. There's a graphical RL called
Lost Labyrinth that's also reasonably simple in design but devilishly hard to play (yet somehow I think LL has no replay value). If you're looking for a more complex RL, I don't think NetHack is the best example. Its controls are terrible, its possibilities are endless and its features are annoyingly eclectic (a Tourist class, sinks in the dungeon, named pets, come on). There's just no focus.
I guess I'll give ADOM a try soon.
You should. :) It takes some time to get comfortable with, but it's one of the most immersive games I've ever played. The same goes for Dungeon Crawl. ADOM has a very complex game world and focuses on fantasy role playing, Crawl is more claustrophobic and focuses on combat, magic, and, well, combat magic. ;) One of the best things about Crawl is that there's a million ways to get into trouble, and a gazillion ways to get out.
0.9.8.5 was the first version I tried, but I always thought what really makes half the game is the music and the sounds. It gives you this great atmosphere. And I never even played the original Doom yet (I know, shame on me), I guess it adds even more for the people who did. But yeah, I really like the challenge games too. Actually a third of the games I played yet were probably AoMr challenges :-)
I'm especially fond of the sound of a shotgun blast followed by a Cacodemon death grunt. :)
Edit:
Plus, there aren't a lot of ways the RNG alone can kill you; most of my TrBe's games ended because I believed too much in their power and/or didn't try hard enough to run once I found myself in over my head.
Heh heh, this brings back a lot of painful memories. :) I don't remember how many Troll Fighters/Berserkers I wasted in Crawl, but TrBe's the only combo I ever made it to the Orb with. Once. And didn't even make it back to the surface. :S