Random notes:
For the first 30 min, Shang-Chi, as a character, wasn't particularly interesting to me. He isn't a paragon of virtue, a leader or even an everyman who discovers inner greatness in extraordinary (e.g. scientific, intergalactic, supernatural,) circumstances. He's not the smartest, most talented or even clever person. He's the reverse of the superheroes we've seen - a man whose past forged him for greatness but found solace in the mundane. A superhero origin story is usually about a person struggling to evolve into a heroic identity, but here we have a man who is comically trying to retreat into obscurity.
It took me maybe 30 minutes to realize this was all by design. His relationship with his best friend, Akwafina, was one of the best things about the movie. But, as an individual, he suffers a bit from the same problem as Captain Marvel - that his character could be fleshed out a little better. While he starts off being mundane I expect him to develop the stature of a superhero but, in the end, he's still a regular kinda guy. Then again, maybe it is also by design that he has more in common with Scott Lang than with Steve Rogers.
I kept thinking his mom's village felt like a low-budget Wakanda. The ten-rings powers seemed somewhat arbitrary - then again, so does Wanda's and Captain Marvel's powers. Still, it was a very good and fun movie. I give it a B+.