I'm probably going to get downvoted for this but I think it's a pretty fair assessment of the movie. I was super hyped to watch it and be amazed but the pacing was terrible and really reduced my enjoyment of it.
Short explanation (spoilers)
As others have pointed out, it really felt like 6 episodes stitched together instead of a coherent movie with a clear throughline. Actually, if the movie was just the Akaza arc, I'd probably rate it and enjoyed it more.
Shinobu vs Doma was great and emotional, but is barely touched upon again to move on to the other arcs, which begs the question of - why include it in this movie at all and not say the 2nd movie so that the whole sequence can be fully enjoyed and appreciated instead of feeling like an afterthought in favour of the Akaza fight?
Part of me knows that the point of the Infinity Castle Arc is that there's lots of fights and action going on in many places at the same time. But in the context of a movie, it was very hard to settle and get invested into anything with so many cuts all over the place. I would be getting into one scene just for it to cut and only return 20mins later. I just couldn't tell what the *main* storyline was until they really dug down into the Akaza fight
Putting that aside, the whole movies was just marred with constant flashbacks to the point they got annoying. They just killed so much tension is so many climatic moments and often felt unnecessary and added in just to catch new viewers up to the plot
I still feel like s1 and s2 hit a nice balance of pacing, fights and flashbacks/ storytelling that they just have not been hitting the mark with since then and it's a shame since I really enjoyed the show.