People are strange.
That being said, I railed against certain elements of Dr. Who when they were knew. I couldn't stand Martha or Donna, and some episodes made me want to beat my head against a wall. Rewatching all of that recently, they weren't *that* bad. I even found Donna more amusing than irritating, and Martha was actually kind of a bad ass. So who knows, sometimes a rewatch brings about a perspective shift.
Doesn't mean I'm going to watch Day of the Doctor ten more times in the hopes of changing my mind about it, though.