Avoiding the rest of the discussion about low hours etc., the initial point about people who aren't that interested in the job isn't limited to this industry. I'm a lawyer and the most FRUSTRATING people to work with are the junior ones who seem to be doing law because it's there, or because they think they'll make loads of money out of it, and don't actually have any interest in the job or law in general. They're frustrating not only because they're not interested and so are reluctant to enter into discussions about the work, but also because they don't make any effort to broaden their knowledge and make themselves better lawyers.
Funnily enough, relevant to the low hours discussion, most of those junior lawyers who aren't interested in the job are the ones who came straight through from university and haven't had any experience in the wider world. In law that extra experience generally makes you a better lawyer - I would have thought it would be reasonable to think the same about pilots.