I can't help but think this movie suffers from expectations created by how it was promoted. The 3 leads being jovial and playful in interviews and such, suggesting a romcom. Admittedly, as a 36 year old man, I did not look into this movie beyond whatever snippets of the promotion snuck into Hot Ones or something my wife was looking at, so I could be off base with that.
But Materialists is not a romcom, it's a romdram. Sure, there's a little bit of comedic levity, but it's mostly slow and tonally weird, with some sudden darkness that really threw me for a loop. Thematically, it's a decent criticism of things like materialism, shallow dating, and how society judges people.
For what it actually is and who it's actually for, Materialists might be better than the rating I gave it. But expecting a romcom and getting characters talking a lot about their dating value or lackthereof and trying to talk each other into or out of being with one another wasn't particularly entertaining to me.
If they dove off the deep end into the dark branch of the story, they may have been able to do an effective subversion of expectations and made it very impactful, now that I think about it.
Instead, it was just a low stakes relationship drama. If you're into that, Materialists might be for you.