I actually did this for numerous tv show season set dvds I have. Though my main motivation was largely to deal with problematic basket-case dvd discs (both double-sided flippers and single sided ones), which were repeatedly skipping, freezing, etc ... on my standalone dvd players. (On the...
In my case I've found that many tv shows of my youth end up in the "you can't go home again" category.
** Going on a slight tangent. **
Though in contrast, I find that I can still listen to a lot of music from my teenage years. I can still listen to albums from my youth over and over again...
I watched these two cartoons too. (Though I was somewhat older than 6).
The only one I could still watch, was the season 1 dvd set of the Transformers cartoon. I found I just couldn't get into the dvd sets of GI Joe and the later seasons of Tranformers.
No tv series in particular.
Most of my disappointment is from watching dvd sets of tv shows I liked as a teenager, but 25-35+ years later through the eyes of a middle aged adult.
If I had never watched these shows when I was a teenager, I would have thought they were really awful tv shows.