Being someone who has studied animation and storyboarding, I really am not surprised that Blizzard go to such lengths for their cinematics...though this article probably gives some insight to those who don't really know much about the animation industry.

Also, it's nice to see Blizzard getting kudos because while they're probably not the only ones who put so much work into their animations, they certainly have produced some of the best game cinematics I have ever seen.

I think it would be safe to say that companies such as Square Enix use similar methods for their animations but Blizzard seem to be better at having a more polished end result.