Today KeeperFX 1.0 was released, marking the completion of the entire original Dungeon Keeper code being rewritten plus a bunch of fixes, improvements and new units. https://keeperfx.net/
Moria / Angband feel more beginner-friendly, while Nethack has you navigate menus and huge lists to get info on commands.
I'm having a much better experience with Moira (https://umoria.org/play/)
I picked a half-troll warrior to begin with and I'm already tempted by treasure found behind walls due to a scroll.
Played Rogue, fought a suspicious amount of Emus, got to a floor where I couldn't find the stairs to continue and searching didn't bring anything up. Not a fan.