How can you think Blizzard isn't trying? They may not be up to your standards but I'm sorry that you expect the game to be perfect. In cata they rebuilt everything from 1-60, added content for 80-85, added 2 races and generally had pretty decent balance for most class and races (at least in the raiding scene that every claims to be the most important thing in the world, next to world hunger). In MOP they added another continent, added content for 85-90, added a race that could go either horde or alliance, added monks, added scenarios, pet battles, and farmville. Oh let's toss in the fact that LFR was just added in a patch.
If you think it's so easy to do all that and keep 10m people happy then start your own game because instead of playing this one you could be on the next episode of cribs. Seriously think for a min. Blizzard takes some chances and makes mistakes but if you think it's easy and that they are lazy, you're clearly not grasping reality.