I wish I could say I know how many mmo games I've played... I used to do beta testing for various game companies and majority of them were mmo games. I don't think I can actually count them. Reason behind why I got requested to do testing likely had something to do with the internet provider I had at the time... century link, they were so horrible, hear they still are but that is besides the point. Anyways the speeds I got from there were below capabilities to play a 3 minute youtube video within an hour. Yeah it took a long time for just one 3 minute youtube video to load up and it was not even that high of quality.
Playing since UO. Don't feel like listing all. My favorites have been UO, original Runescape, Dungeons&Dragons Online, Vanguard Saga of Heroes, Age of Conan with its first director. Dungeon Runners, EQ1. DDO by far had the best quests/dungeons, character creation, skills and loot.