Mmm Nethack! And thats because long long ago I got my introduction to roguelikes on my A500, just can't remember what it was exactly. Hack? Rogue itself? I really can't stand most commercial RPGs, they're just not juicy enough and the idea that milions have done exactly the same in the game gives me smelly feet and stuff..
Now on closer scrutiny I do count among those who find Nethack itself a bit silly, so make that the ADOM port for the Amiga. But thats just because there's no Dungeoncrawl port for the Ami..