The Anniversary event really showed some of the weaknesses with some of the daily quests.

This is an MMO, people play together, and in events such as the Anniversary one, people will grind the living shizz out of dailies like this, you know that. Why oh why do you insist on making players compete with one another over quest objectives, why is it that having other players around de facto increases the time I have to spend in order to finish a daily, with people robbing the quest objectives from underneath one another's noses. If I wanted to compete with other players, I would go into PvP land, why can't you design quest dailies to actually incentivize coorporation?

Gold Coast is a shining example on how this should be done, Minotaur quest objectives are instanced and do not disappear when someone grabs them, hence they are free to take for all questers. In a group, you even get quest advancement if another group member grabs them before you.

Wrothgar is horrible. Edu is by far the worst one, I actually actively avoid doing it simply because it takes ages to finish off the secondary objetive. The problems, as Manavortex spelled out for you, is that the respawn on the mobs is extremely long. Poachers is pretty bad too, seeing as other, competing groups often wipe the whole zone free of echatere, mammoths and other animals that drop meat.
Compare that to Zan the Titan and Nyz the Dwemer automaton, or even Cori the Reachman, and you can see how easily you can grab those secondary objectives. They even respawn very fast so it doesn't take forever to finish those.

Vvardenfell world boss dailies are great, they can all be finished off pretty fast, even with competing players around.

Then there's Clockwork City. Once again horrible game design. People compete with one another for the Daedric intrusion sites for Fine Feathered Foe, dropping AoEs all over the place and ult'ing down the mobs as fast as they spawn, keeping other players from being able to score a hit. This is Edu all over again.
The Imperfect isn't much better, the quest objectives at least spawn somewhat faster, but once again you have to compete with all the other players to grab them first, just to have several of them tugged underneath your nose by someone else.

ZOS - basic game design tells you that in an online MMO like this you should incentivize coorporation, yet your quest design only incentivizes being selfish and snuffing your competition, aka. the other players. some of the world bosses you get right, and they are nice and easy to do, others you do very, very wrong, and people actively avoid doing those dailies just because how frustrating it is to get nowhere in your quest advancement, simply because there are other people around.

This goes for some of the daily delves as well, especially the CWC delves in the Hall of Regulation, where you have to collect quest items that only drop from Factotum NPCs. The place is stripped completely clean of Factotums, and people ult down every Factotum they see meaning you can spend a good while just running down empty hallways and build up frustration.

Please consider the coorporation vs competition when designing daily quests for an online, multiplayer game.