So the entire concept of Nostalgia or Nostalgia itself is bad (as that link says) just because the shows it can sometimes blind people too happen to be crappy? What about the good ones? Heck, what about Nostalgia outside of TV shows? Not to mention that blogger seems crazy. Wiser mind, indeed.
In short, yes. If there's merit to be found in something old, then it should be able to stand up on its own without the benefit of nostalgia to prop it up. There's lots and lots of old stuff out there which can do just that. There's other stuff out there which can only stand because of nostalgic feelings that people have for it, and in those cases, I don't think that nostalgia is helping either the works themselves or the people who love it.
Nostalgia is nice and it makes us feel good, but you need more than just nostalgia to really enjoy something. Nostalgia is a spice that some people want to make the entree. Nostalgia (especially as a marketing concept) wants us to forget the ugly and the bad. Sometimes that's an acceptable price to pay for a good memory, but it's still fundamentally self-delusion and that's always something to be wary of.
-- Ed