If we don't allow these new people into scenarios, where do you think a big huge scenario-worshipping base can come from?
I agree with one-thing: Many people DID join Aces High to try out the scenario. Is there anything wrong with that? Alot of times, the scenario makes the game for people. I know many a people who fly in the MA once, twice a month, yet every Multi-frame scenario they are there as COs, XOs, GLs, or the loyal pilots you would be lost without seeing them there.
New scenario player's are one of the best aspects of a group. You see them evolve. Pre-Frame 1/Frame 1, they get frustrated, but when they hit that 'special moment', they fall in love. Frame 2, they start becoming one of the better aces of the group. Frame 3, that newbie is giving neat ideas for your group to do. Usually off base, but, he has the enthusiasm. Frame 4, they become the 3rd leader in the group, answering questions, giving the posreps. After Frame 4, they're ready to be a GL in the next scenario.
There are VERY simple ways to avoid this frustration. Schedule group practices just with your group. Teach them the basics, how to fly this plane, and radio courtesy. If your GL seems his doing nothing, take charge. You schedule practices, round up the troops. The GL may lead you on battle-day, but you'll be the one people would rather listen too. And the CO would most-likely trust you more.
If you have a problem with the CO, complain to the CO/XO first and foremost. Tell them your concerns, and why its hurting the team. If they dont improve or ignore you, keep pressing. If they still seem incompetent, leave it at that. You may be hated by the CO near the end, but, this isn't the CO's team. It your team along with everyone elses. If you feel you have an idea to help the team, speak it. The CO may dismiss it or like it, but you would have generally helped the team on way or another.
Also, it is often hard to tell who makes a good CO or a bad CO. A great XO doesn't always translate into a good CO. COs must be battle-tested before you know how well they're gonna do.
In short, the best way to avoid frustration with new scenario players, train them to be better than you
Aub