Well seriously we have been at this airsoft thing since 2004, and people come in for two months and think they know everything. If they payed attention at the games they would notice that we are always asking if anyone has a scenario they would like to run, but it's not all that often that people do.
On top of that, like Micov was saying, all of the better scenarios require prep and only the person that understands the scenario can really do that. So if Micov wanted to run one, or ghost or anyone then we have always been open minded about it, they just need to do the work to make it happen.
As for the teams being uneven on the last game, the only team that was short any members was the US team, because me and fish bailed on them, until they picked up Trigger and Panic late in the game. The "Merc" group fought for the Al Queda team first, then fought for the Militia team and finished the game with the US team to make things fair.
So if you are going to come out and accuse people of being unfair, you should probably know all the facts first. And if you are going to accuse me personally of always using my scenario... well then you just don't pay attention.