Well I only have one problem with daily quests and questing in general in WoW. This is all subjective so if I state something as fact all I'm saying is that it is, in fact, my opinion. It's terrible that I have to say that ahead of time lol but here we go.
They are not fun. At all. They "might" be interesting from a lore perspective but there are so many its unreasonable to expect quality writing on all of the quests. There is nothing fun about picking up X or Kill Y amount of Z when they don't even put up a reasonable fight for the ten thousandth time. That isn't even hyperbole for some players, see the above post. Dailies, reps and most dungeons represent a very simple non challenging wall to overcome or continue to grind to taste the greater parts of the game for me. It serves to slow me down and pace me and that is all it does. They aren't fun gameplay at all.
I think that people who complain about daily/normal quests are really just complaining that they aren't as good as the parts of the game they lead into and its sad that they make up such a huge amount of the game when the only reason people like myself play is to experience what is behind the wall, and it isn't because that experience is behind a wall that makes it interesting or enjoyable. The wall exists to make me pay Blizzard for longer because what does exist is short lived and must survive until the next meager amount is added with a new wall. It is a substitute for actual content as far as I'm concerned.