There's been a lot of commentary, here and around the web, on why dailies become so hated during Mists of Pandaria. One aspect, though, that I feel most people haven't covered is the issue of reputation rewards. All through this expansion, almost every expansion reward has required either honor or valor points. Your reward for finally get Revered with the Klaxxi was having to run a few dungeons so you could actually buy the stuff you unlocked. That put an extra twinge of pressure on the whole thing. Not only were you trying to figure what faction to grind, there was a voice in the back of your head, "I'm nearly valor capped. I'd better do my dailies so I actually unlock something to spend them on." While getting valor from the dailies themselves might have got you part of the way there, you still felt like had one more gate before you could actually get the stuff you wanted.
In Cataclysm, things were different. Once you hit exalted with the Dragonmaw, you didn't need valor points. All you had to do was head to the quartermaster, buy Boots of Sullen Rock, a raid-level piece of gear, and add them to your tanking set.