Zombies were never intended to be the main enemy, players on the other was. Sure zombies are very annoying mostly because of their pathing. But you are supposed to feel nervous all the time, because of the fact that you might as well get shot by a sniper hiding anywhere on the map waiting for you. For me that's enough to keep playing, not only as the guy getting shot but also as the guy shooting. I would personally hope that rocket and his team doesn't change the zombies to become to powerful, fix the pathing and make them run inside again and they would be more than fine.