Which is fine. It works for Overwatch, and it to some extent, has worked for WoW up till this point. But as said, it's hard to feel threatened by cartoon-looking demons. Blizzard took literally everything else for Legion from Diablo III. The least they could have done is take the demon art style. At least the demons in that game are visually threatening. Most of the demons in Legion are not in the slightest.