You might think you must have an innate ability to have good design sense, and if you weren't born with it you have no hope. I don't think that's necessarily true. An innate sense certainly helps, but I think with enough studying and practice, anybody can develop good design sense. Design shows are fun to watch, but not always helpful in educating (at least the ones I've seen). If you know and understand the elements and principles, hopefully it can give you a way to verbalize what you like, don't like, or what's missing.
I hope I haven't bit off more than I can chew!