Good topic, good question.
I am happy with my ability but I know I have a lot to improve. Mayhem showed that without the pressure of other riders around me, I'm a much better rider. I really don't like knowing there are others in front or behind me: those slower or faster!
I think it all stems from concentration and being able to focus on me and not f7ck up my lines. So, that's the part of my riding that I really need to improve; concentration. Because when it's broken my riding goes to pot, literally, even the simplest of lines or tasks become an ordeal.
I think that stems from how I ride now and how I rode as a teenager: on my own with a map! It's a personal, insular thing. Don't get me wrong, I like cycling with others without any pressure but I don't like to hang around either. I'd rather be the slowest in a quick group than the fastest in a slow group.
Oh and downhill. I'm too much of a pussy sometimes because I fear a dreaded handlebar swing dented tube moment. But of course, to avoid those moments, you have to give it some beans and be brave. I'm better than I was but there's significant room for improvement.