YMMV / Eroninja

• Arc Fatigue: At over 100 chapters and over two and a half million words long between all the side stories, the overall goal is no closer than it was at the very start. Between Naruto letting alliances die because they make one of his family members unhappy, Lemon Sage adding several new antagonistic factions, and his insistence on giving every character screen time, many readers became irritated with how the story never seems to actually go anywhere.
• Unintentionally Unsympathetic: Suzume is meant to be a Sympathetic Inspector Antagonist who is opposing Naruto because she doesn't realize he's a good person and because the ancient order she belongs to is too indiscriminate. Suzume believes Naruto is a "Corrupter" (that is, someone using the Temptation's Touch Jutsu) and is raping women to build himself a harem. Her logic amounts to "Naruto seems popular with women but also has a girlfriend, therefore he must be a Corrupter," but her investigation goes nowhere no matter what she does. Even her attempt to (fake) drunkenly seduce him fails with the young man seeming more mortified than she is. So her solution is to encourage her barely legal student Moegi to act on her longtime crush for Naruto. At best, Suzume is setting her up for failure since she knows for a fact Naruto is in a relationship already. At worst, she's presenting a serial rapist with a brand new victim who will be his eager slave even after he's killed or Moegi will sell her out and they'll both be the willing slaves of a serial rapist. Even her preferred outcome amounts to her student being almost or actually raped but Suzume killing Naruto and saving his victims. Not helping matters is that Suzume admits she doesn't actually think Naruto is a Corrupter and she might be jumping at shadows^note Neither she nor her teacher or her teacher's teacher, etc. have seen a single Corrupter in well over a century so they have almost no concrete ways to be certain beyond seeing someone use the Temptation's Touch but she's willing to go through with it anyway even though her only "proof" is that several of Naruto's many friends are women. To make matters worse, the order's training method amounts to an older woman taking a barely teenage girl as her sex slave in order to "train her to resist a Corrupter". Suzume comes across as He Who Fights Monsters at best and Knight Templar at worst.