Since MoP's release (actually before that, but especially since then), the game has started to bug me, and the reasons are simple.
I am a teacher by education, which means that in addition to an 8 AM - 15 PM workday, I have at least 2-3 hours of extra work when I get home. Add driving to work, cooking food, spending time with friends and family, I am left with very, very little time to play. And that's where my problem comes in. Since then, the game has become nothing more than a giant pile of dailies. You want gear? Do dailies. You want quests? Dailies. You want end-game content without raiding eight days a week? Dailies, dailies, dailies.
But guess what? I don't have time for dailies! And neither does the average casual player in a similar situation like me! I am in a casual guild with casual players, and it has become nearly impossible for us to keep up with the immense amount of dailies required to even give the game meaning. Cataclysm was a faceroll in tabards and dungeons. MoP is a mountain of dailies, only climbable by those who have hours to spare every day.
Well, Blizzard, I don't have time to do several hours of dailies every single day, and neither does 95% of the casual players, and I have a guild full of them to back me up. I have friends who play, and they spend all afternoon doing dailies, sometimes even more!
As I'm writing this, I haven't logged on for about three weeks, and I am considering cancelling my account, because the game simply isn't playable for casual fun anymore. Sure, I can level up new characters, explore and do that sort of thing, but where's the progress in that? In Vanilla, TBC, WotLK and Cata I could play 1-2 hours every night and maybe on saturdays, and I'd do good progression. Now, that's not possible anymore. I spent every available day/night from MoP release until November doing dailies, and it led me nowhere, because it wasn't enough time to do them all.
Please, Blizzard, make the game playable for casual players again, you managed it fine for six years, don't screw it up now.