IMO MCU movies have been graded on a curve for a very long time and that seems to have started to wear off with Eternals. We're only going to see more and more of this going forward unless they shake something up. And not just critical reception wise, but box office too (see above re: Ant-Man's recent collapse, its not gonna make a lot, comparatively speaking).
Watching a new Marvel movie after watching something like Puss in Boots 2, Maverick or Avatar 2 feels like moving back in with your parents as an adult.
I think moviegoing audiences are more..."resilient" is not the word I'm looking for, but it's close. They are far more "tolerant", I guess, than critics/sections of the Internet believes? One only needs to look at Michael Bay's
Transformers, which have never been any good outside
maybe the novelty of the first one, and yet, despite constant critical panning every installment, people kept watching them and have them rake in billions until
The Last Knight was so bad even the average Joe thought it was shit.
The Fast and Furious franchise is also not high cinema and have similar/forgettable plots, but people still go watch them and they still make billions. Even DC, which has had way more failures under its belt, has people willing to give it a chance to the point I have seen lots of excitement for
Flash of all things despite Ezra Miller's everything (well,
Shazam 2 and
Aquaman 2 looks to be in trouble tho lol).
I can't predict the future, but I do think it's still premature to say this is what will happen with future movies based on
Quantumania. The
Ant-Man movies, while charming, have never been big money makers people were excited to see. And post-Eternals movies include
No Way Home,
Multiverse of Madness, and
Wakanda Forever, which all did very well (despite Multiverse having tons of problems plotwise). One might say that's because Spider-Man and Black Panther are already popular on their own regardless of their MCU affiliation, but in that case, if the worst case scenario is people not seeing MCU movies outside the sub-franchises they like (Spidey, Black Panther, GotG, Avengers), it's not that dire.
More creative risks is a good thing, but the public is fickle on what that means and whether they will go for it. Sometimes you get GotG, Ragnarök,
Wandavision, or
Werewolf by Night, and people like that a lot. Other times you get
Eternals and
Love&Thunder and people are just not on board, especially the first where the director pretty much had as much liberty to do what she wanted. If the reception gives mixed messages, I feel like Disney is going to get the message to just continue playing it safe like it does with most of
Star Wars (I know it has a bit of a different problem but bear with me), and then we end up in a situation where once in a while there is a
Mandalorian or an
Andor, but they are the exceptions rather than the rule.
EDIT: a lot of the discussion about the MCU these days just feel like this skit to me
View: https://www.youtube.com/watch?v=Pzlb3PzdNJk