I'll be honest, you're getting deep into the Marvel universe with this one and a lot will feel like it's rushed because of how big these characters are and where the roots originate from, so you have to understand with such big characters you're goin to get a big climatic feel. It didn't matter to me that the cast was diversed, I thought the actors alone worked well together, my friend Evan who I went to see Eternals with, would keep telling me how proud he was of the Gilgamesh character, a strong Asian american who he felt had no limits. Evan did end up crying when Gilgamesh was killed by a deviant, and quickly started to chant justice for Gilgamesh. So all in all some people will have this connection with the diverse cast, me not so much, but I can understand why someone would.
Evan was also very proud and tear-eyed of Phastos in this film for reasons unexplained...
We don't agree on the reasons why we like the films, he likes the film more for societal purposes as for me I just love Marvel.
So if you love Marvel like myself, you're going to enjoy this film.