I would prefer to get an explanation why it's bad (could be short, picked from a list of 3-4 predefined reasons). If it's my cock-up that's fine, but if it's something mods didn't find proof of then maybe I need to resubmit a better report, or if it's something that's not considered against the rules that'd be helpful to learn too.

Other than that, an occasional bad report is not worth worrying about.