Which Anime Started Brilliantly but Slowly Lost Its Direction?

Some anime begin with an exciting premise, interesting characters, and a story that keeps viewers hooked. However, somewhere along the way, the writing starts feeling weaker or the plot becomes less interesting. Which series disappointed you as it progressed, at what point did you notice the decline?

Sword Art Online for me. I was hooked by the idea of being stuck in a game and having to clear it to get out. Then the time skips kept jumping past stretches of Aincrad I wanted to see. I would've happily watched a whole season of them figuring out how to survive and clear floors.

The Promised Neverland comes to mind. The first season was brilliant, with a tense story and characters who always seemed one step ahead. The second season felt rushed, though, especially with how quickly major events were handled. It lost much of the suspense that made the beginning so exciting.

I think Tokyo Ghoul had a great start. The first season had a dark atmosphere, interesting characters, and a storyline that kept me hooked. As it continued, the pacing became messy and some important parts felt rushed. It had so much potential, but became disappointing.