I enjoy Dungeon Crawl Stone Soup played in the terminal with ASCII graphics. I wonder whether there are other hidden gems out there which don't get attention because they are "ugly"?
That's improved now, though, with the steam release. Before the Steam release I exclusively played DF with Ascii graphics. Honestly, I thought it was pretty.
It does have a certain charm. I never really played that much tbh, my favorite part was reading the sagas of fortresses on the forums. Those were always so unpredictable and hilarious.