That first point on Turning Point can be a serious pain when the zombies have 1 or more engineers that spam their main weapon into the ship at the beginning of the map and they bounce all around inside there, especially with that upgrade that makes them bounce more than normal.
It's such a weird character to play these days, like a TF2 Demoman and Engineer mixed together. I could definitely see some changes for this character in future.
On that speed of characters sidenote; one way you can balance characters is by giving them different base and sprinting speeds. I'd like to see that come to BfN (along with damage drop-off), which would make the game a better experience to play.