23. Secret Invasion
One of the more recent Disney Plus shows, Secret Invasion had everything going for it. It was based on one of Marvel Comics' most iconic storylines (and we know how well the MCU usually adapts those) and it was the long overdue starring role for Samuel L. Jackson's Nick Fury. But, for some reason or another, it just didn't come together.
One of the show's biggest issues was its pacing. Even though it was only six episodes, it felt so much longer than it actually was, as scenes would drag on unnecessarily, the villain (Gravik) would deliver lengthy monologues, and very little would actually happen for long periods of time. And as badass as he is, this was a threat that was too big for just Nick Fury, so the poor writing around why the Avengers couldn't intervene never felt credible.
The show also drew criticism for making some irreversible story decisions for no reason that retroactively hurt the MCU as a whole. And then there was the lack of focus on Olivia Colman's Sonya Farlsworth - who was definitely the best thing about it. Oh yeah, and the CGI-heavy battle at the end just resulted in the momentum that it did build completely falling apart.
Secret Invasion had so much potential and it certainly realized that on occasion, but the show never lived up to expectations.