Everyone cares what they get... there's nothing wrong with having a desire to fly a certain airframe. But don't let it rule your attitude in primary. I always said that I really wanted jets and if I didn't get 'em, I'd go home, get drunk, and wakeup the next morning and say I'd be the best helo pilot in the Marine Corps (bloom where you're planted and all that). On the other hand, we had people in our primary VT who thought they were OWED a certain airframe, that if they didn't get it, they would make a big stink about it. People like that weren't the most popular studs among students and IPs. bch knows who i'm talking about.
While students care what they get, they also are usually fairly ignorant about the various communities. I know in my primary squadron, we could only really hear about the helo side of the house, and it was pretty limited there too (skid guys were too senior to be up on the fleet really). There were no jet guys or C-130 guys to tell us anything about their communities. In my opinion this was the biggest let down in primary. It's hard to make an informed decision when you haven't been exposed to your choices much at all. So while it's fine to say you want to fly a certain aircraft, don't knock the others unless you're up on what they do.
/rambling