I don't consider myself a jack-of-all-trades, although I may be considered just that. When it comes to audio post I do everything - DX (dialog) editing, Foley performance & recording, sound effects creation & editing, music editing and rerecording/mixing. Although I do all of those things I feel that I excel at DX editing and music editing. Don't get me wrong, I do very solid Foley and sound effects work, but would not consider myself an expert, at least at the "Hollywood" level. Maybe It is partially due to the fact that I don't have the facilities/budget nor do I do as much work in those areas to become a pro at those. My mixing skills are also quite solid, but (maybe, again, because I don't have the tools) I don't personally feel that I have the intuitive, natural instincts that many of my peers possess.
Hey, my clients are always quite satisfied and my peers never have much to complain about, but that is how I view myself.