this anime was one of the first animes I ever watched. ill always have a slight bias towards it. especially the aincrad arc. that being said. I actually kinda like the change from VR to AR. it definitely is not a perfect movie but it is worth a watch. SPOILER FOR SEASON 4. SPOILER SPOILER
if you're like me and watch the entire series on Netflix, Then you could probably understand my confusion with the scene where Nautilus and Yuna stepped in to save the Sao survivors in underworld. I was like," who tf is this skinny looking mf ", that was until I watched the movie.
the movie also furthers the relationship between Kirito and Asuna even more than they already did. I mean that is what SAO is about. besides the action scenes and underlying threats, SAO is a story about kirito, Asuna, and their undying love for each other.
overall, definitely worth a watch but don't take my word or anyone else's words for it. go in and form your own opinion on it. Goodbye