I think I have a solution here. For whatever reason WoW hits the system really hard. I’d noticed crashes ever since 8.3 and I couldn’t figure out what was wrong. But I saw that some full system crashes were caused by WoW sucking up too much CPU. Try launching wow with this command, it makes wow “nicer” to the rest of the system. I saw significant performance increases and have not experienced a crash yet when they were quite frequent before:
nice -n 20 open /Applications/World\ of\ Warcraft/retail/World\ of\ Warcraft.app