I'm not saying all NH fans think in the way I explained, I'm just giving an example of how a potentially a considerable number of them might see things. Let's be honest, a good portion of the time when a certain NH fans is giving their opinion it ends up being less about what Hinata does and more about what Sakura doesn't do and how she is. Instead of talking about how great Hinata is from her own standing they talk about how much Sakura sucks compared to Hinata.
It feels like most of the time instead of trying to bring Hinata up they would rather bring Sakura down. They do it because Hinata isn't that big of a deal by herself, and they know it, therefore they have to bash Sakura in order to have some standing. And the only reason why I can imagine that they would insist on defending such a small character as Hinata is, despite it being hard, is because they conclude that at least she's a better option than Sakura, so Hinata will have to do.
About AU Hinata, so you say people disliked her because she was jealous of Sakura? That sounds to me like they're pissed off that AU Hinata sees Sakura as a threat which actually can further solidify how solid the NS relationship is. It seems to me they were less angry at AU Hinata's personality and more about her acknowledging the existing potential of NS.
Yeah, I know what you mean. Don't worry. The problem is that many wants Naruto to be a one time quitter and that token would be used on love. Selfish and random if you ask me. Unfortunately, Naruto will always be like that, so this is something that many having a hard time to accept it. You know what's the problem in general: accepting. Look, when it comes to reviewing, you can point out the good and bad, BUT, you can't say "because it didn't go your way." That's not your story, it's his. You can still decide what's good and what's bad on how it's handled, but not because it's not your take. It's like movie adaptation. You can't really expect the exact same content, but you can only hope the changes make sense.
That all said Naruto is not the guy to play the lesson of "wrong love," that's Sakura's job now. Kishi only present one person to do one lesson and when doing the same (such as revenge), one must be different from another (Itachi and Pain). Sakura is doing the finding the real love card and no one should have that. You could argue, "What about Hinata?" Well, she can play, "Time to be independent from this point forward" card. The result is not the same as Sakura. See? But again, sadly, people wants Naruto to be a quitter. Well....Too Bad.
Ugh, YES! There are quite a bit of SasuSaku fans who "sideship" NaruHina clearly just to get Naruto out of the way. They insist that "It's NOT sideshipping!!" but come on... They can't seem to think of any reasons why NH will happen except that "Hinata's loved Naruto for so long, and Naruto has only been positive towards her so what would be the reason to have Hinata harbor those feelings??" There were some who didn't start "shipping" NH until Kiba's "Don't try to look strong in front of Hinata, Naruto!" comment, and/or 615. Eh, I should stop before I go on a rant haha.
Yeah, I've recently been reading some old threads [on NF] from 2008/2009, and there were quite a few neutrals (+ people who don't ship any of the Big Three, like SasuNaru fans) who pointed out Sakura's growing affection for Naruto. Of course, after Sakura's confession to Naruto and that whole thing, some of the neutrals were like, "Uh, she still loves Sasuke? Wow..." And that's pretty much that. But even so, the rest of them (and even including those neutrals/SN fans who sort of changed their mind that Sakura had growing feelings for Naruto) still see that Sakura has shown feelings for Naruto that could be non-platonic, and that NaruSaku >> SasuSaku (and NH too, but NH is not as bad as SS in most eyes), anyway. 
You know, what made me believe that Kishi is clearly not done with love triangle is ironically chapter 540. Think about it. Kishi made the Kage Summit Arc the way it is. Many of them left with a cliffhanger note, mainly Naruto vs. Sasuke and Naruto's intention, which is reserved for Sakura to communicate with Naruto before the storm. That moment won't get addressed until these two finally fight and certainly we won't get it in this current arc. That said that left Sakura in wait mode, which no one has because they don't even know. Naruto claimed that he will tell them AFTER it's over. So there you have it, an NS moment on hold.
Anyway, back to what I was saying before. The reason why I said 540 got me thinking differently is because you have to connect the dots. First of all, if you want to use the interview, Kishi claimed, "Naruto is close..." which made me wonder why did he even say it. Second, Sakura thinking Sasuke almost felt nothing new; however, going back to the old chapters, it's strange but the true is that this is the very first time that her love was questioned. To make matter worse, 635 made it a connection without even bringing it up. The sad part is that this is actually the first time in a long while that they are reunited yet she doesn't like it. That's a bad sign. 540 was about her trying to think Sasuke is a great guy, which she couldn't do it. 635 is about herself seeing Sasuke as a person, which she also fails. This is a setup for that climax of her feelings and so, it's on hold.
The one thing that really screwed the idea of NS being dead is Kishi's ongoing teases. The problem again is the fact we are so deep yet we are still getting them like it's all good. No, that's unacceptable if NS is not meant to be, let alone if others are. The movie should have them not talking about date at all, hell I'll go far to say not even having a dilemma with each other. Now, in manga, there shouldn't be 631. It could very well just say, "Thank you for healing him" and that's it. Shut up, Minato. But no, Kishi wrote to it and destroy the fandom zillion folds. Here's an idea: do it for HINATA. That all said it's impossible to think otherwise anymore because now it's fully established that NS will only continue to rise and possibly end up together in the end, while NH is demeaning (not me, Kish) to a friendship level and SS is on verge of ending.
The worst for them is Sasuke is not a team player in pairing war. Hell, he is continuing to show that he's the worst man in there, stopping one man from killing Naruto just so he can do it. There's not one moment that he has a good quality. He helps just to end the war. Orochimaru said it best, not interested, but since the world itself is in danger, why not. After the war, it's all up for grabs. There hasn't been a sign of him being nice or anything, only furthering the idea that he is shady and just the fact he got mad at Naruto is not a good sign. This is war, focus on that only.
Bottom line...do I need to explain more...