Elder Scrolls Online: Tamriel Unlimited has addressed many of the issues that plagued the first title.  There are still some issues with clipping, connections, and voice chat, but the game is still quite enjoyable with plenty of quests to complete and areas to explore.  It isn't the perfect MMO by far, but at least it's one that won't cost you $15 a month and you can come back to it whenever you feel like exploring Tamriel.