Instructions are sloppy, code can be sloppy, but what I find is: when they review code changes they find real stuff. Not all the real stuff, but more real stuff than human reviewers typically find. A code review doesn’t need to be perfect, not even 100% correct, it just needs to show you stuff that you look at and think “damn, good to catch this now instead of in a field problem report a year from now…”
Instructions are sloppy, code can be sloppy, but what I find is: when they review code changes they find real stuff. Not all the real stuff, but more real stuff than human reviewers typically find. A code review doesn’t need to be perfect, not even 100% correct, it just needs to show you stuff that you look at and think “damn, good to catch this now instead of in a field problem report a year from now…”