I’ve found only one good code review bot, and that’s Unblocked. It doesn’t always leave a comment, and when it does, it’s often found 1-2 real bugs in the code crossing multiple files (even like “hey you forgot to update this reference in this other file not edited in the PR”). Things you’d expect someone with a deeper knowledge of the code to know.

You do get a handful of false positives, especially if what it reports is technically correct, but we’re just handling the issue in a sort of weird/undocumented way. But it’s only one one comment that’s easy to dismiss, and it’s fairly rare. It’s not like huge amounts of AI vomit all over PRs. It’s a lot more focused.