elder scrolls online? ES online isnt that fun, especially when trying to do quests together, it isnt setup to be done in a party. maybe much later end-game content was made that way.
i personally do not recommend ESO. you will need to buy new dlc content everytime it comes out if you wish to stay with the endgame crowd.
oh there is a star wars galaxies emulated server
http://www.swgemu.com/forums/index.php
basilisk server 900+ players
Its a star wars themed sandbox mmo. You aren't given directions. You have to find yourself in it. Many crafting professions and skill types like beast taming or bounty hunter. Jedi were rare players because in order to become one you had to find these hidden objectives or quests and that took about 4 months of work. So back then if you saw a Jedi you were like whoa and also scared cuz they were very OP in combat, basically unkillable. I don't know if theres a bunch of them now because the secret jedi quests get posted on internet.
I have not every played swg or this server. But I know people loved this game before sony changed the game's mechanics to compete with WoW.