No, sorry, it's rude. It is rude to complain about a gift you receive, created for you in good faith, because it's not to your taste or even objectively poorly written. It is also rude to complain, as an author, about perceived differences in enthusiasm between your recip's comments, or your recip not leaving a comment to your taste or whatever. You don't get to jettison basic manners because you feel entitled to complain about receiving badfic.