In my experience those that said they don't want jets did not have the grades. Since as mentioned there is a cutoff score for jets those marines above that score were drafted for jets regardless of what they wanted. Jet grades almost always equaled a jet assignment.
Because I was in the Training Command long ago, I can say that there is some truth to this but not always. When I selected it was after the FY, and no one got Jets for eight weeks, they had stuffed the pipeline at the end of September. So everyone went Helos, P3s or E2/C2.
Every kid (almost) comes to NavAir wanting to suck and blow in the hottest new jets (F4s/F14s/FA-18s now F35s). Most guys end up loving what they fly, and wouldn't trade it for anything. If you have an issue with being a Helo driver, then rethink your desire, because you could end up there. It can be a sh***ty place, they do eat their young; but the flying is pretty awesome.
What USMCFlyer said about the Corps is true, long gone are the days when you went PLC to Pensacola; every Marine is a Rifleman, end of story. It's a great tradition, a great place to be but it's not for everyone.
Every Naval Aviator is also a Naval Officer, and you're judged on your paperwork and leadership prowess as well as your Airmanship. Maybe more so.
Good Luck, accept what you get with good grace, and remember to have fun. They're paying you to do that, you know?