I agree entirely. While I've specialized (and spent the vast majority of my time) in reverse-engineering, I also write fiction, do sound engineering, (used to) draw, have recently started playing the drums, etc. Am I particularly great at any of these? Not really -- at least not yet -- but that's ok.

As an aside, we've all heard the standard "jack of all trades" quote, but everyone always leaves out the last part of it, which I feel is most important, if only because of the way I can relate to it: Jack of all trades, master of none, though oftentimes better than master of one.