However entertaining and fun the MCU has been at times, I'd say they've clearly gotten away with a lot when it comes to movie making. Like there are plenty of films in that franchise/cinematic-universe that just wouldn't have cut it and would have died on the scrap heap as stand alone films. But the MCU glow kept them alive and folded them into the giant stream of MCU content.

Beyond that, I'd bet that the post-endgame stuff has been done objectively badly ... like you could break it down into a number of poor movie/franchise making choices (like you can't simply build a story out of "a multiverse", it isn't a character or plot idea, you need more). Love and Thunder was an awful film. Can anyone tell which characters are part of the story and which are being written out any more? Etc etc.

It's all still popular though. Beyond that, your argument is a strawman ... the MCU can be a give away (because, IMO, it has clearly made a number of missteps) without the question of popularity v quality being an issue.