On the opposite end of the "new user" perspective that is trying to ask a good question, as someone who is seeking to sometimes answer questions, it is pretty hard to actually find a good question. The vast majority of the questions I run into _are_, in fact, duplicates, poorly worded/incomprehensible, far too broad, etc. (one example that has stuck with me is "how do I install HTML/JavaScript on my computer?").
Though perhaps there are good, legitimate questions out there, it is also conceivable that some frustrated new users think that their question is appropriate for SO when it is not. This most often happens, from what I've seen, in the "far too broad" category. Just looking at SO right now, for example, I saw a question that was asking how to pass data on an iOS app from one place to another. In that user's mind, he/she has probably been trying to figure out the basics of making an iOS app, and this seems a legitimate question. However, this is an incredibly broad architecture/design question. SO isn't a resource to hand-hold you when you're learning something new. It's a resource for asking specific questions when you can't find the solution anywhere else (and you've actually tried).
Though perhaps there are good, legitimate questions out there, it is also conceivable that some frustrated new users think that their question is appropriate for SO when it is not. This most often happens, from what I've seen, in the "far too broad" category. Just looking at SO right now, for example, I saw a question that was asking how to pass data on an iOS app from one place to another. In that user's mind, he/she has probably been trying to figure out the basics of making an iOS app, and this seems a legitimate question. However, this is an incredibly broad architecture/design question. SO isn't a resource to hand-hold you when you're learning something new. It's a resource for asking specific questions when you can't find the solution anywhere else (and you've actually tried).