The Dependencies on World of Warcraft are incomplete. The ms-fonts need to be added. For Arch linux those are ttf-ms-fonts from the AUR (Arch User Repository), Link: https://aur.archlinux.org/packages/ttf-ms-fonts/ . For Ubuntu I read it is the ttf-mscorefonts-installer Package. Someone maybe wants to confirm on the ubuntu package.
I was missing those dependencies and always got an error with:
Battle.net Helper.exe crashing.
Also this dependency is probably needed for ALL Battlenet Games.