Sure, it isn't as good as the manga but the animation is very stellar and stands the test of time even today even if the story is a bit jumbled.
What exactly did you not like about it?
OP here, I went into it thinking that it was a motorcycle movie and got body horror on acid(not that i'm complaining about that, it was very well animated) got to a point where I was just waiting for the next death scene and the ending made no sense.
I'm surprised you didn't know much about Akira, given its cult-like popularity. I suppose that would blow anybody away if you thought it was going to be a motorbike anime.
Either way, maybe consider watching the movie again in a few weeks and see how you feel, you really do benefit from repeated viewings, likewise, I would recommend the manga as it feels like an epic compared to the anime and is totally different in almost every day.
The crazy monk lady on the bridge is actually a major detailed character with her own major role, among other things.
Back in the day Japan had a hardon for open endings where nothing is explained which is why so many shows have shit endings, it is until recent years that they've realized that a propper resolution is better in most cases.