Limited progress on Portal but max progression on Zombie mode

Seems like the zombie mode is broken (rushed like everything in the game). It could have worked if they would have taking more care choosing the maps.

And it also exposes the problems of the specialists, just play as Mackay and get on a car or another high point with a ammo pouch. On some maps the zombies never even get to you.

I got almost 500 kills in a game, never felt so stupid before...