Belatedly (sorry, been studying)...
What made me fall for this show--and what has me 20-some years later still completey enamoured with it
Yup, it was that evolution of their relationship that really captured me as well. I'm a sucker for a good superhero show/movie anyway, but I loved the fact that it wasn't just a matter of 'hero shows up and instantly gets the girl' (though as I was a teenager, I'll admit that Dean's looks didn't hurt!)