Marvel films are the popcorn flicks of the 2010s. None of them are masterpieces, but most are just a fun watch.
But now they're often not even that. Besides a few outliers (No Way Home, GOTG3), they fail to even be entertaining popcorn flicks. I'd say the line is National Treasure. If it's better than National Treasure, that's a solid popcorn flick. If it's worse, then it's not worth watching.