the zombies absolutely need re balancing.
tank is far too powerful. and has far too much health
witch has too much health and should be player controllable like the tank
the smoker should get a direct damage ability, he's kind of terrible
the hunter is fine... could probably use a little bit more health to make him more like a faster more wimpy tank without any tank utility
boomers are my favorite to play. the spraw needs to be weakened a bit for versus mode, and should have a faster cooldown. maybe a sliver more life.
yayyyyy my opinions voiced on the internet. maybe valve will read!