The Marvels for me was fine, a bit of light fun with a few disappointments and a few more weak elements.
There was no real sense of urgency, all the stakes and threat just seemed very low and unthreatening even as they tried to tell us they were high and very scary. Poor Rambeau Jr felt under-served by her key character scenes being directed without any sense of drama, not helped by a bit of a stiff performance (she also started feeling stilted at the end of Wandavision after she powered up, after being a standout lead for the first half of that show... no idea what's going on there. And yeah, the musical planet felt like they were moments away from doing a big Broadway musical/Bollywood movie song+dance number and then just kinda dipped their foot in that without committing before backing off without a proper song. That was a real shame. And they then noped right out of that planet moments later, making it feel like it was a lot of setup for nothing.
But still, Kamala was dorky and fun with the same infectious enthusiasm from her show, Danvers had a few good lines and moments, and there were several good laughs throughout. This would've been an upper-end-of-the-middle-of-the-pack movie in Phase 2 or 3, I feel. But apparently the discontent from multiple stumbles has boiled over into anti-hype (assisted, no doubt, by the usual "grr no girls" haters) and so this movie is tanking all that negative sentiment to some degree, seems like.