Kino der Toten because it's too simple, and Samantha's evil teddy bear room creeps me out...
Zombie Verruckt because:
1. Instead of the whole of the team in one area, the team is divided in two and can't be united until the power is turned on. Plus, the power switch is all the way on the other side of the map. What were they thinking!!!
2. Superman zombies that can down you in one hit, punch through windows, are twice as tough as zombies in other maps, move at insane speeds, crawlers that move faster than players, etc.
3. A map design even more cramped than Five and Nacht combined.
4. It takes two knives to down a zombie at round 1, four at round 2. After that the knife is basically useless.
5. Only map where you actually need Bowie Knife and Pack-a-Punch, and they don't have it.