Vulture for NetHack in an isometric graphical interface for the roguelike engine: NetHack.
I have spent less time playing the Elder Scrolls series combined. This game is addictive, frustrating, and hasn't lost anything with age. Delve into a dungeon, combat a thousand different monsters in random generated levels to complete a quest of epic proportions. I love this game.
I love roguelikes, but will gladly accept tile graphics over ASCII if given the opportunity. Unfortunately, the original tilesets for Nethack are horribly small on my 1080p monitor. Vulture allows a larger graphical display in addition to the more user friendly UI. And of course, Nethack itself is a ton of fun. People unaccustomed to roguelikes may not "get it" at first, but I encourage them to come to an understanding of roguelikes in general before casting final judgments. Try out WazHack for a similar experience.
I have to admit, the 3-D grafics for Nethack is REALLY cool, but the clunky grafics creates a headake and sometimes makes it hard to see. Its also lacks in creative. Things look clunky and absultly eye-hurting. Its a good idea by the modder, but it needs some work...