I thought it was good. Acting, music and story were solid. Angela should be seeing some best supporting nominations. I haven't watched the first in a long time so I'll need to watch them back to back to see which is better.
Spoiler (click to reveal)
Tchalla and Nakia have a son that they named Tchalla. As long as they don't reboot he should be ready for young Avengers unless they find a way to age him up
If I had to say which comic arcs they used, I'd say Dark Reign, Strum and Drang, and minor AvX, just for the visuals. I did appreciate that they found a way to make the standard Atlantian soilder a viable threat