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We tend to hate it because
1)The fanbase - A large portion of them are everything the world thinks of stereotypically as an anime fan.
2)The threads - They create a bunched of forced threads on the same topic at once, then freak out when they get saged or trolled even a little and create a dozen more.
3)The artwork - Over the years a mangaka's artstyle changes, most people accept that, but Naruto's gets worse and worse as time goes on, at this point most people don't even use the "style" argument to defend it, it's just getting bad.
4)The characters - It's full of annoying uneeded characters who never get any real development. In fact, the main characters don't either, instead of developing them, they add a new one. And female characters are underused and mostly ignored.
Do I need to go on? There's a lot more. Naruto is pretty bad in my opinion but the point is that people some enjoyment out of it usually try to claim it's high tier manga, come to /a/ and make stupid troll threads thinking it's /b/ 2.0 from the get-go and try to force it down everyone's throats.