I love dungeons, and I love dungeon crawlers and roguelikes too. I like the challenge that a good dungeon provides, and it feels very "classic" to delve through one that pushes your character to the limit. I thought the Eye of the Beholder series was great, for example. I only wish it were turn based.
EOTB was awesome for its time. It had some great puzzles (such as hidden buttons). This reminds me...note to self: stay far away from walkthroughs.