I'm really enjoying ESO, but there are some things about it that bother me. The biggest problem is that it doesn't really promote team play. A recent poll on this very forum confirms this. Every character you create can perform just as well in every area as the last. It really doesn't matter what type of character you create because they're all nearly identical.
I'd rather play a game where, at some point, a mix of classes is REQUIRED before moving on. I mean, except for the truly masterful players - there are always some that are amazing - you should HAVE to team up to continue the quest line. As it is, a magic based character is just as survivable as a fighting character. ... makes sense if you don't think about it. This is an MMO, after all. Team play should be paramount.
I want the game I play to be the opposite of that. I want the game to present obstacles that a fighter cannot overcome without the help of a mage. And a mage will require the help of a fighter just to survive. I want the game to make healers VERY helpful - if not required - for much of the game. There should be points in the game where, if you don't have a thief to sneak (scout) around - disarming traps - you WILL die (especially without a healer).
Now - some things I'm really looking forward to: The Justice system! Awesome. The Champion system. Equally as awesome. The Dark Brotherhood quest line. Bring it on. I'll be playing this game for a long time. But if someone develops a game like the one I just described - I'll leave ESO in the dust.