I've played about 18 MMOs. Never found my ideal one, always hoped the next one would be it.  But I intentionally avoided WoW because based on player feedback I knew it wasn't the kind of game I was looking for.

The ones I liked the best were Eve Online (no other game has been able to replicate the complex and deep PvP this game has) and Vanguard Saga of Heroes (just because I found great friends there)

I played these:  DikuMUD, GemStone IV, Achaea, Ultima Online, EverQuest, Eve Online, EverQuest II, Guild Wars, Lord of the Rings Online, Vanguard: Saga of Heroes, Darkfall, Mortal Online, Rift, Star Wars: The Old Republic, Guild Wars 2, Black Desert Online, Elder Scrolls Online, Crowfall, Pantheon: Rise of the Fallen (in alpha)

I've heard good things about Dark Age of Camelot and Runescape and I kinda wish I had played them.  Maybe I will.