Well no one is bothered with this detail. I'm surprised Mei was not listed - her having flashy abilities is enough to be counted as a "developed" character for many.
Thing is Sakura couldn't fall in love with Naruto ( guys don't like rejection) , still Naruto was longing her for a considerable period( annoying girls whose own target of crush is looking is focused on someone else and isn't even looking at them) was enough to get her hated to begin with. It didn't help that she had no Flashy tech or more exposed body to make her more interesting for fanservice lovers. On top of it some wanted their favourite character to get a girl with better gene-pool or clan ( arranging married for profit.. cough* and most of them would scream at arranged marriage idea.)
It didn't help that she was part of the team 7 with most OP characters of the manga and instead of just making sandwitches and being just another Rin( just a nice supporting medic+ damsel in distress to be protected), she kept trying to be able to keep up with them- Something which instantly would make her a target for misogynist fun by all.
In the end despite being the most developed female character, Sakura still doesn't satisfy expectations of many users because of one draw back on another as stated above. She has realistic ambitions and limits and weaknesses as well. But while making her Kishi constantly struggles to make a place for her in a shonnen where women are needed but not allowed to overshadow the males characters. Right there but a step behind.
Hinata on the other hand was presented as an ideal wife material for most of the guys out there- good figure, polite and devoted and she has bayakugan and inheritance of Hyuga clan to boot.
No one is going to question why she didn't try to take care of a wild Bolt drawing on hokage faces during such an important meet in the village. Shouldn't she be more alert about picking him from school and taking him to Neji's grave when his antics seem to be well known? No one would let Sakura get away with that kind of negligence

p) if she was the final pairing. Even her child cannot be her own and her relationship must be abusive(Interestingly enough even some Sasuke fanboys join this idea- tells something about the kind of fan they were for that character) to satisfy the hate.
It's funny that people are so passionate about her character ( even if negatively) even after the ending of series when they are no longer discussing Naruto or Sasuke all that much. it can be a topic for a thesis.
Of course not. But you have infinite patience to hate imaginary character which didn't do anything personally to you.