After a few more rewatches, I guess I have to lower my answer to an 8 or a 7.5
Mostly it was a great tribute to Chadwick, with good action and a lot of highly charged emotional scenes, but the third act was a bit lackluster, with the final battle scene on the boat not being nearly as epic as it should've been. The fight between Shuri and Namor was very solid (though it was a bit dumb Namor didn't even try to throw her back towards the water). Also, biggest critique? Needed more M'Baku.