I don't know. Maybe I'm still in the sweet spot of Nethack enjoyment. I've dabbled for ~15 years and have yet to ascend (because I'll binge play it then put it down for months or years). The jumble of fantasy and other popular culture elements is still refreshing, and reminds me of early text adventures like Zork or Adventure/Colossal Cave. If there are no real visuals, to speak of, then I appreciate that I am being asked to imagine something other than straight up Tolkien-esque fantasy.
All that said, Brogue is the most enjoyable RL I've ever played and the one I'd recommend to beginners.