This has generally been my experience with most highly acclaimed movies over the past 10 years. Most recently had this w/ Marty Supreme... last year had this w/ The Brutalist and The Substance.

The first half has me thinking instant classic, my hope is sky high. But then toward the end I find myself looking at my watch and realize it's simply not going to the stick the landing.

OTOH, many acclaimed streaming series have generally done this well. My take is that as long-form storytelling has evolved, movies have transitioned into this post-modernist phase as directors/writers don't feel they have the runway to tell something truly cohesive that doesn't end up being trite. It's much more about saying 'something' or imbuing a feeling than telling a fully fleshed 3 act story.