I used to play roguelikes almost exclusively for a few years since they were the only things that would run on my very old system back then. My favourites were the ones that had less abstraction and big worlds to esplore. Dwarf Fortress, UnReal World, Cataclysm (that's the old Whale's Cataclysm btw), things that had big maps, less dungeons.
I still played the classic dungeon crawling ones too, I liked ADOM and Stone Soup.
I found I had a big soft spot for ones that were more like a tactical shooter. DoomRL (loved the way the shotgun behaved in this) and there was an Alien-ish one that was never finished but it had a very detailed and novel approach to firearms and explosions/grenades, I can't remember the name exactly, "Xenocide" maybe?? Very detailed, verrry atmospheric even though it was a tiny fragment of a full game, kinda spooky grim on the ship!
I was so fond of those ones that I had plans of making my own cyberpunk one. Don't steal my idea pls, but it was gonna be Ghost in the Shell all virtual and cyberpunk and you gotta infiltrate someone's mind and go down > deeper through the layers and things aren't always as they appear! Combat would be very tactical, methodical, dangerous!! Probably take a lot of influence from Shadowrun and stuff too. Never got much beyond planning though, I'm not programmer enough for it yet (that actually means i'm not motivated enough and i spend my days crying too much).