You also have to take into account how big their projects are. Blizzard's cinematic team are sure as heck not pushing out hour and a half films every year. Anyways, Blizzard is still great at what they do. Beautiful cinematic.
Pixar is (or was) notorious for rendering full images with no compositing. In any case, I believe they're over 1000 people now (and DreamWorks is even larger), and both of those campuses are much bigger than the cinematic department at Blizzard. It doesn't make any sense that Blizzard's cinematics team would be larger than…
Supposedly they're doing a second cinematic for the "siege of garrosh" and its supposed to be epic and brutal. Remember the first half of the expansion is "discovering pandaria"
Supposedly they're making a second cinematic about the siege of garrosh, so this one is probably supposed to be a bit lighthearted and the next one will be insanely brutal
If Blizzard were to start a Kickstarter where they said their cinematics crew were going to make an entire Warcraft movie, they would get millions and millions. That was absolutely awesome.