So far I've enjoyed this game type, granted played on 30-50ping mainly on Decoy and coaltown.
I haven't gotten a shot at man up mode yet due to the servers being bricked. To be honest Australia has always gotten the **** end of the stick when it came to server allocation because we're so damn far away. Maybe Robin walker will remember us and throw us a bone or two.
I find the only main issue the game seems to suffer from is teamwork that really just doesn't exist 90% of the time on pubs, either because you have a 12 year old who thinks he's the worlds greatest sniper, or a medic who forgets there's more than the heavy he's been overhealing for the last 5 waves. And with only 6 slots available what are the odds you're going to get 6 decent players..
I guess the best way to get around this is to play with people you know.
So my proposal is that some of us start to go on regular servers to see how we go with each other, and then when we feel we are ready, jump into Man up mode and make sure we reap the rewards =D.