Enough has been said by other reviewers about the film's overall weaknesses - it's overlong, meandering and drags in many places. Instead, I want to focus on a question no one else seems to be asking: what is up with these Wakandans?
I was a definite fan of the first movie, but as the sequel progressed, I found myself more and more annoyed (and irritated) by the film's semi-religious Wakandaphilia. Frankly, the constant self-adulation and smug sense of exceptionalism displayed by every Wakandan character really started to grate. After a while, what I'm sure the film-makers see as a message of empowerment starts to sound a lot like fascistic aggrandizement. If this degree of messianic self-love were displayed by characters in any other (real) country, it would be dismissed as overblown nationalism.
Let's not forget, as the film itself points out, Wakanda is a superpower - possibly the most powerful nation on earth, thanks to its stocks of 'vibranium' - so it's difficult to swallow the idea that they are also somehow persecuted victims. Add to this the fact that they jealously try to preserve their monopoly of this most valuable resource, and its associated technology, and its hard not to see Wakanda as just another arrogant and self-interested power.
Indeed, after a while, my sympathies shifted much more to the rival Talocans, who with some justification came to see Wakanda as more of a threat than an ally. Maybe the next movie could be called Talocan Forever, and show their side of the story instead.