I am probably too old school: Unless properly documented (the "whats" and especially the "whys") and provided with a test harness (plus the test cases, including all fringe cases btw.) just reject it straight away. And in the case it is provided and you have a hard time understanding it, reject it as well with the comment that, the "demi-god" (author) should provide documentation which mere mortals can follow.

That principle can be applied to both LLM slop and handcrafted rubbish. Eventually most people will get it.