Wizardry

One of the first party-based first-person dungeon-crawling roleplaying games. Has a horrendous random number generator that kills you all the time. Half the game mechanics feel unexplained, death is semi-permanent, and corpse recovery is a pain.

Sounds Awful
Only a little bit. It was a forerunner of the genre. What do you expect? The stuff that followed was pretty solid, though. Ever hear of Dragon Warrior?