At least in part because it's not PC to go against the prevailing Hollywood PR meme and in this case, you'll be called raciss if you give it a negative review.
Hollywood is rapidly proving that they can screw up movies based on comics that people love just as badly as they screw up anything else. The PC crowd can spew trash about "re-imagining" all they like but they can't match things that are true to the original author's vision the way the makers of "Lord of The Rings" was.
Hollywood is a mentally incestuous, sexually perverted, morally bankrupt little world all its own and the small group of people who don't fit that mold as a rule don't make decisions and don't have a say. Consequently, as the older people who had some small connection to reality die off Hollywood will increasingly produce products that reflect their own closed thinking, perversion, and moral bankruptcy.
I am sure Black Panther will be better than most films. But if they are saying it is better than most MCU films of past 10 years. No.
BTW, I have yet to see Iron Man 3 , recent Wolverine films too.
Until now, whether they hail from the DC or Marvel cinematic universes, big-screen superheroes have traditionally been white dudes put on this earth (e.g. Superman and Thor, who each came from other planets) or fashioned by the U.S. military (à la Captain America and War Machine) to defend America from its enemies. Co-written and directed by Ryan Coogler, “Black Panther” is a radically different kind of comic-book movie, one with a proud Afrocentric twist, featuring a nearly all-black cast, that largely ignores the United States and focuses instead on the fictional nation of Wakanda — and guess what: Virtually everything that distinguishes “Black Panther” from past Marvel pics works to this standalone entry’s advantage.
https://www.msn.com/en-us/movies/reviews/film-review-‘black-panther’/ar-BBIMrgy?li=BBmkt5R&ocid=spartanntp