Wow I love this mod, it's really fun. Don't expect to be in action all the time, it's much more exploration/survival type and much more slow paced than other action zombie shooters, but the atmosphere is damn great.
I also played on Atlanta server yesterday and it was completely playable on NA ping (escaped the EU server nighttime :3).
The only thing I don't really like is the buggy/teleporty zombie movement, hard to predict and shoot them unless you run inside or something.
Oh yeah and they should definitely add melee, not as one of the main ways of killing, just as the last resort so you can finish of a zombie if you run out of ammo.