Which MMO can you call a Landmark MMO? And why? 3 titles come to my mind Ultima Online. This is the game that started it all for a lot of us. It set the bar for the genre. Everquest. This was just a big leap in general quality for an MMO. It boasted great graphics, great gameplay and was quite unique at the time. World of Warcraft. WoW didn't reinvented the genre. It refined it. It definitly lacked originality but the overall quality of the game is something that was never seen in an MMO. Not my favorite in any way, but still, WoW is the game to beat right now.