It is just the lull in between movies. The cynicism kicks in or some site needs some click bait. Shang Chi and The Eternals are the bottom of the barrel and they still made bank. ...
Peter III of Russia: I don't want to kill you. You're not a bad person.
Catherine the Great: I could kill you. You are a bad person.
Peter III of Russia: Would you like mine? It matches your hair. Just happy to be happy together, is it not?
Catherine the Great: It is marvelous – you are marvelous. You gave me a bear and have ceased punching me. What woman would not be happy?
******
The trick to fringe licenses like Shang Chi and Eternals is finding someone like Yorgos Lanthimos ( The Great, The Lobster, The Favourite) Someone who just punches out good interesting dialogue and brings even mundane type characters to life. If people are oversaturated with the Marvel heroes and the MCU, then Shang Chi and Eternals should have tapped into the kind of satire that Lanthimos brings to the table.
The problem with Eternals wasn't that it was a Kirkland Signature brand version of Thor/Captain American/Iron Man/etc, it was ignoring the interesting elements of any large collective. There is no reason why the Eternals couldn't have been the working class C team version of the Avengers and everyone knew it.
The Great is an incredible show, because it has fun. It wants to have fun. It wants you to have fun. It's not trying to be Xerox of what made money before. Guardians of the Galaxy hit deep with fans because it's fun.
Sure you can have grim ugly themes like in CA2 Winter Soldier but the world building was set up for the Russo Brothers already. With something like The Eternals, you are starting from scratch, you have to make your audience care about these people.
Elle Fanning and Teen Bop version of Hank McCoy aren't even all that great as actors. But the writing is so good it lifts them up. It's like Feige forgot that you just need to tell a good story first.
Anyway, for those where The Eternals makes you want to take a nap, watch The Great instead.