Elder Scrolls Online is not a bad game in and of itself. It's just not that fun, IMO. It simply carries on the typical MMO BS. It's only difference is the first person mode.
Lets list it's flaws....
1; Not worth 15 bucks a month
2; Segregated platforms
3; Far too many fetch quests and grinding
4; The ES gameplay does not work in MMO style. It's not the same game.
I think what they should have done was simple use a Guild Wars type online system in ES single player games. Make a few major cities into player hubs, and allow players to communicate and trade within those hubs. Outside the hubs, the game reverts back to single player, with the ability to form parties of up to 4. It would allow the choice of multiplayer gameplay, without forcing it.