So there there is no doubt by the time you reach the end of this post, I loved the film. It was a terrific visual experience with a real human set of stories to care about. There was sufficient humor to keep it fairly light, but there are dangerous and dark moments in the film. There was a huge amount of creativity expended to make this movie into the "WOW" experience they want you to have. That said, there are issues that I had with the film that keep me from declaring it perfect as an animated movie.
Let me start with the run time of the film. Two hours and twenty minutes is pushing the endurance level for a movie so filled with visual texture, easter eggs, and action. I found myself looking at my watch and wondering if I could take a break. This will be no problem when the film hits streaming and video platforms, but as a continuous experience in a movie theater it sometimes felt like I was being assaulted over a long period of time. There is a lot to see and the screen is rarely static, so when you spend a longer amount of time watching, it can be a bit of a strain.
There are two or three distinct stories in the film, and as such, it felt like a lot of things were being stuffed into the movie. It is true that some of the stories have parallels in them, so showing them in the same film allows us to make comparisons, but each of those stories felt like they could have been a movie unto themselves. Maybe a little trimming on each of them would allow the film to move along more efficiently. One of the problems with these multiverse stories is that there is always another villain/hero conflict to explore, so it never feels like you are getting anywhere. Like a swimmer fighting a riptide, there is so much weight that keeps pulling you away from your desired destination.
I suspect that everybody's favorite sequence in the film will be Mumbattan on Earth-50101, with the local Spider-Man Pavitr Prabhakar. He is a hoot and the visualization of him in the densely populated and high traffic version of India is a blast. The character has skills that are great but a personality that is self mocking and appealing at the same time. Hobie Brown as the puck rock version of Spider-Man also appears in this sequence, and without much context, we understand him but maybe can't quite relate to him. I'm sure fans of the comics will have a different outlook because they will know his story more and so his attitude may be less off-putting.
Keeping track of all the Spider-Man variations, and all the Universes they inhabit, is something that should be left to the fans who want to keep flow charts and infographics. The idea that there are canon events in the Spider-Verse makes sense, but we are left to guess what they are. Obviously, some are self apparent, but the one that turns out to be the driving force of the movie is not. It is difficult to reconcile heroes who protect their worlds with the self interested individuals willing to allow deaths that are preventable for "The Greater Good". Miles Morales may only be a kid, but he has a pretty good sense of right and wrong in contrast to the members of the Spider-Society who have decided to play God.
One more word of warning/slight hesitation. The movie is long, but not because it takes a while to get to a resolution. It does not arrive there. This is an "Empire Strikes Back" middle chapter in a trilogy, and the story stops on a cliffhanger. The final segment is supposed to come next year, it was supposedly written and worked on simultaneously with this film. So unlike the Star Wars film, we will not have to wait three years to find out what happens. But you will need to see this one again before then, and that should not be a problem.