Are you at least considering just releasing the playertype if your not going to release the gamemode, if not someone should just make a variation of the Left 4 Block Zombies but in Robot Form.
I mean the playertype can be used for something other than just the gamemode, it could be used to make videos, like a infiltration of a lab or something, or just fooling around.
Not all servers would be stuffty, and also if they where stuffty no one would join them, and just by joining servers with more than 5 or 7 people.
Server preview addon also helps.
And if they start bad, they may get better with time that passes, you tell them what is wrong and maybe they fix it.