One of the biggest drawbacks in my opinion with ESO, is how lack lusting the end game really is. You do have trials, but I don't feel that there are any real goals or anything to "compete" at an end game level. I've never been a raider in other MMOs in terms of doing it hardcore, but I have been raiding in other MMOs, and I now came to realize how important the raids are.
Trials aren't raids, not by a long shot. Raids are long, filled with trash and difficult bosses. Trials have some trash, a few bosses and you're running on time.
I never thought I would say it, but what I'm really missing in ESO, is a couple of good sized 10-14 boss raids that'll keep me occupied and want to return and play the game. There are content in this game, a lot of it, but there aren't any true goals coming to end game. No antagonist that threatens any more, nothing that needs to be "dealt" with. The biggest threat was the Daedric Prince who got his behind kicked before you even came close to end game.
I think that if ESO is going to survive, they need to revise what happens once you hit end-game. I do like the increase on level cap as well as added zones and quests, but the whole execution isn't too good. You need a group to do quests in Craglorn, in a game that has the worst grouping tool imaginable as well as a community that grinds rather than do quests. And once you've hit level cap, you're pretty much "done". Many of you would say that there are many other things to do, and you're right, there are. What there aren't however is a sense of accomplishments or reasons to do said events.
So hopefully they'll add real raids soon, and that I mean 10-14 bosses and some overarching antagonist that needs to be brought low.