Often old productions can be judged by their "rewatch value" - the willingness of fans to come back to them years later when they're not the latest installment - or even part of the latest iteration - of a franchise anymore. Have you found that certain serials score differently after a cooling-off period? In particular do you find that certain mysteries, twists and other suspenseful moments feel different when you already know what happens next. Personally I was hostile to Victory of the Daleks at the time for I strongly disliked the New Paradigm design that was being foisted on us, but as that design never properly caught on and was later quietly reverted the pain now is dulled. Indeed, the Series 5 aesthetic in general is more pleasing to me now whereas at the time it felt quite gimmicky. On the other hand something like A Good Man Goes To War is worse in retrospect. At the time it was an exciting hook, but I don't think it stands up to multiple watches because it's mainly there to set up (and get us hyped for) a series of complicated story arcs that wound up never having a satisfying conclusion, so in hindsight it almost looks like the root of where everything went wrong for the Moffat era. What about you? Are there serials that you disliked when they first aired but like now, or vice versa? You don't necessarily have to go back and watch them all again, but just remember the gist of the plot.