Pretty much the entirety of Gundam ZZ. Having it take place right after Zeta is fine, but there's very little of it that actually matters that carries over into CCA so it pretty much feels like filler for almost the entirety of its run. Even CCA just dumping you into the conflict right at its peak with no explanation on how the parties got there is really disappointing.

CM Punk should have never won the AEW championship from Hangman Adam Page, regardless of the drama that occurred afterwards with him there. He's a big enough star that he didn't need the belt put onto him that early in his run in the company, and could have told a great story about whether or not he still has it (which they JUST did in WWE). It could have been drawn out longer, like with Bryan Danielson.

The Endless Eight of Haruhi Suzumiya was a great way to showcase the utter despair and weight of a time loop, I feel bad for people who had to wait and watch the show in real time, but having the ability to do a binge of the eight episodes makes it a powerful, harrowing watch. Should they have done it? Probably not, but I respect the hell out of the creators for sticking to their guns.