Late to write this but a few weeks ago I finally watched The Eternals, the most poorly reviewed Marvel movie and I won't say I loved it, I actually liked it quite a bit and appreciate a lot of what it is doing. It's weirdly a bigger and smaller story and despite deciding to have Jon Snow as a completely unimportant Marvel tie-in, most of it really stands on it's own as a big sci-fi epic. It's nice to see the Celestial REALLY getting a sense of scale that we often don't see even in the constantly bigger and bigger Marvel movies but I feel like it's a lot more consistent than the other two non-Spider-Man phase IV movies. Both Shang-Chi and Black Widow felt too married to formula and tone in a lot of ways to stand out in the way some of the other Marvel movies did and while it's not like the Eternals is completely breaking the mold, I feel like it's not like Shang-Chi devolving into generic "protect that one gateway".
I get why it fell flat for a lot of people (keeping in mind, I haven't been reading a lot of people's complaints), as it is moves slowly but I really don't mind at all, especially since it is nice to have an alternative to the general zippy Marvel tone. I feel like there are a lot of big ideas at play and I think it can be picked apart, I still like the idea it's about humanity. They are space gods but without going into much detail, the idea is they all have the same origin (re: genetically), move into different cultures and often become of them, then need to come together to stop a crisis they are also responsible for and also the big white guy is the jerk who wants the awful status quo that will lead to us all dying. Again, I think once you dig into it, there's probably a lot that will fail in this wild juggling act in retrospect, I was very much in for most of the movie. I also like that it's not trying to be as quippy. There are a few moments of that which feel slightly inorganic, I find it often works when it does try wit and does it at it's own pace and mostly saved for Kingo and his valet, who are great characters.
The weakest thing to my mind is the Deviants, who work well to kick off the plot but Kro, despite having a potentially interesting element where he basically knows that the Eternals are the real baddies, he never really coagulates into a compelling villain and feels like he can be completely excised from the last act. If anything, maybe he should have just been saved for the sequel though I suspect he'll return with some Deviants a little more similar to the classic Marvel ones.
So, it's not perfect, but considering Thor: The Dark World or Iron Man 2, it's weird that this film was received so coolly. I guess I got more out of it than most and frankly, I'm happy at least I could.