While I’m probably not anywhere close in age to the rest of you (I’m 15), I can relate to your feelings. It’s probably the same old thing coming from kids, but honestly, there’s a reason why most of us feel this way about our parents. It’s because they’re straight out pesky, annoying, frustrating, and they just flat out piss you off.
My parents are, on the whole, good parents. But my mom tends to judge my inadequacies, such as a C on one quiz, first (as probably usual), rather than, say, a 100% on a math test.
She yells a lot as well, and constantly blames her mistakes on me and my sister. And my sister’s pretty bad herself.
But my mom just takes out trivial frustrations on us. For example, getting back from a visit with her friends in San Francisco, her birthplace and childhood home (we now live in Virginia), she commented hours later on the relatively few things that hadn’t been done.
My dad, on the other hand, is a very relaxed person usually, but when he gets mad, he yells a bit too loudly. It has a slight tendency to resonate throughout the entire house, riddled with words not worth repeating. 
These are relatively trivial and unworthy complaints though, especially taking into account the previous posts in this thread. We are a very happy family on the whole, and I’d say that, with a few extremely minimal changes, we’d be even better.
This thread worries me though. I was actually looking forward to the time where I can have high regards for my parents; both as parental figures and as ‘friends’. I was looking forward to times not of imperatives and demand, but of good discussion and laughs. This thread makes me wonder about that a bit. 