There are a lot of themes in BP that NO superhero movie has EVER touched upon. The X-men movies dabbled into these but not as deep or as layered as Black Panther.
In BP, there is stuff on-
1. Black on black violence (part of Killmonger's story is basically Coogler inserting himself and his personal experiences in Oakland into the movie; this is in addition to the battle at the end)
2. The loss/absence of fathers in the African-American community (this was very obvious)
3. What role the rich/richer nations should play in the world and how much of an issue immigration is to these countries (this was one of the greater debates that went through the entire movie not to mention there are a ton of "W'Kabi's" in the United States now)
4. How African tangibles and intangibles have been taken away by colonialism permanently (apart from the Wakandan spear, the other artifacts in the British museum are real and the originals are yet to be returned to Africa)
5. How Africa itself has kind of "lost its way" (highlighted in the conversation between Killmonger and his father, the very serious Boko Haram problem in Northern Nigeria which has hurt me personally as a man of Nigerian descent
)
6. Killmonger is a "reverse Hamlet" (except that he was a full villain)
7. The depiction of an African state unencumbered by colonialism and slavery and what could have been
8. The very positive depiction of black people in a big budget movie wrapped up in Afro-futurism
9. Strong women (people talk about strong women but almost every black man particularly those from Africa understand just how much the African mother has to deal with and how much REAL strength they have)
e.t.c
Seriously, what Coogler did in BP to touch upon all these issues (obviously he couldn't go to much into them because it's a 2 hour superhero movie) was a minor miracle and after studying the movie carefully I'm firmly in the camp the movie deserves all the acclaim AND an Oscar nomination. The only down side to the movie was the dodgy CGI at the end (like seriously, it turned into a PS2 game at some points).
Heck, the movie deserves accolades for Killmonger's speech choosing death "like his ancestors that leaped off the boats instead of slavery".