Many know about World of Warcraft.
But before "WoW", there was Ultima Online.
Before "UO", there was Meridian 59.
Meridian 59 actually was "doomish" looking first person perspective MMO that was way ahead of its time. It's original creator 3DO was going through a rough time of being bought and sold so they couldn't support the game, so it never took off like it could of. Near Death Studios tried to breath life into the game again, but WoW put them on a slow course with death that culminated yesterday. Interestingly, the websites are still up for NDS.
Near Death Studios Closes | Edge Online