No classes are OP. On any zombie survival 1 human could do a suicidal run and get around 50 kills. On Mr.greens, people all camp together at the start, killing the starter zombies quickly, no matter their health. The zombies go and attack the afk's lowering their hp because they have "help" and then they complain about op humans. That's the way I see it. I think most of it is fair and apart from some asses and "survival of the fittest" ( you know who you are..... )It's great.