Crawl consumed my spare time for some years, i even got good enough to streak 4 wins in a row. I disagree that it's a shallower game. Crawl is streamlined, yes, but the game mechanics are so finely tuned that at a tactical level its depth surpasses Nethack. That is, if you play an interesting combination and not MfBe or something :p The tactical complexity leads to strategic complexity at the margins when you're pushing for low turn count wins or streaks with difficult combos.

Ah, now I want to log back on and do a run :) I'm curious to see how the game has evolved since I last played.