What specifically is wrong with Common Core math? I've seen a lot of vague complaints about it but the materials my children brought home seem fine. It's different from the way I learned but I haven't seen any compelling evidence that it's worse.
Yep. From what I recall from my time in education about a decade ago, Common Core standards were generally considered excellent. The rollout of Common Core tests wasn't that great, but that should have been a one-time adaptation period, but everything got mired in politics and bit by bit got torn apart as states all went their own way.
Doing multiplication without laboriously writing one number over the other with an x next to the bottom one considered deeply suspicious...