Most of the DORs and attrites I have seen were mostly chumps that didn't belong there in the first place. However, there are always the few that have the motivation, but just don't have the skills.
As far as DORs go, you probably think you have an idea of what Naval Aviation is, but you can't really know until you are there. My ideas and views have changed a lot during primary and advanced, and I'm sure they will change drastically when I get out to the fleet. Some people discover that it just isn't for them.
So, which is better, to gut it out because of pride, or to quit? If a person like that does perservere and earns their wings, all they have gained is a career of doing something they don't really want. I personally can't imagine why a person wouldn't want this job, but it they don't want it, it's better to get out early.