Welp it's fucked
They took something that was perfect and fucked it up. Black ops 2 zombies was also fucked all this shit they added is really un fucking necessary
Need to be online to play zombies for all the treyarch CoDs barring WaW, so you're going to have to wait until a private server is set up to play it, which will be a long fucking time and they always get shut down pretty fast.
May aswell just wait, by that time there'll be a repack and the PC port will
/might be fixed.