The Peanuts specials of the 90s were not quite as sharp as the previous ones, save perhaps for "Why, Charlie Brown, Why?"
Oh, yeah. They got extremely experimental, then Schulz died and they became extremely safe. And focused on Rerun for some reason. I've never seen Pied Piper, but have heard bad things. I think that was intentionally supposed to be juvenile.
But the ones I really dislike (and someone's gonna chew me out for this) are the "This is America" series. Except the one about NASA. That one's actually pretty good. But that they have completely watered down schtick to "accurately" portray historical events takes away the appeal of the Peanuts characters. They're brand of somehow hilarious and adorable neuroticism just doesn't fit with historical content. The Thanksgiving one, especially. Seems like they're either yelling at each other in a way that's played for drama or infodumping what's going on.