I found the game and its premise to be extremely unique and fun compared to a lot of whats out right now.
But.. after a few weeks into it i felt the game seriously lacked some real content.. i got tired of having half a dozen guns and just 4 characters. The game was amazing at first but as soon as you memorize every part of each map by heart.. it needs something new.
The only fun i had on VS is when the game was auto set to the hardest difficulty.. and you usually didnt last more than 30seconds - 2minutes into each scene

Much more challenging.
At the time i played at release i dont know if it was a bug or just due to most people having insane lag.. but if you were on the zombie team and it was your turn to respawn about 50% of the time you would never respawn. You would just have to wait around for the next few minutes until you actually spawned or the round was over.
That along with the lack of content made me put it on the shelf for now. I might get it back out when this update is released if it hasnt been already. I dont really follow it anymore.