I'm not sure if this can ever be fixed but imo there is nothing worse than going through the cool quest lines and being involved in the story only to approach an area and have 5-6 other players killing everything and "racing" to the end of the quest line.
RPG's are great at telling stories and attempting to pull you in to the scenario and make you feel like you're a part of what's happening. That is completely ruined by masses of other players just mowing through everything to camp the final boss etc. Even if they don't camp him you lose the challenge of completing the quest by killing the mobs yourself and tactically finding a way to take down the final boss. I'm lvl 29 and I love the game but it loses alot of its Elder Scrolls luster when the quests are handled this way.
Maybe it's inevitable and the game is and will always be that way but being a huge fan of the open world rpg genre it kind of ruins the questing experience. I like mmo's too, but something with the Elder Scrolls name attached to it should provide more immersion and fulfillment.
I enjoy the game and will continue playing, I just hope Zenimax continues to make improvements and reward the players that stick with it.