I agree with you in most part Tricksie...but really as far as I hate the ending there is nothing to contribute witht the probability that Hinata is a bad mom or not. Its obvious by the ending that Bolt misses Naruto as a father figure,and with this the only thing we could argue is that Hinata probably isn't enough of a mom to stand up to Naruto and say that he is drowning to much in work ( AKA Internet, ramen and drinks) and forgetting his son.
But there is no indication that she is playing favorites
There's not much indication of anything, really. Unfortunatley you can interpret it however you like. Is Hinata really parenting like her father? Probably not...maybe not.... Uh.... My point is, surpassing her father's parenting style was never her goal. So why wouldn't she just be continuing with what she knew? I guess it all comes down to whether you want to give her the benefit of the doubt or not.
We have no indication of anything about Hinata because she's a cardboard cutout of an otaku ideal. There is no development that shows anything about her other than that she succeeded in her one goal of attaining Naruto. That is the only thing we can be certain of.
I'm sorry, but I think you're looking way too into it. There's nothing to imply that Hinata is playing favorites with her children or that she neglects her son. Bolt's feelings of resentment and neglect are directed towards his father as far as we know. We won't even know about his feelings towards his mother until the movie and spin off.
How you see Hinata is up to you. That's the wonderful thing about cardboard cutouts. There's nothing propping her up so you can make up whatever you like about her. It's exactly what editors were hoping for when they moved her into the heroine slot and pushed Sakura out.
There is nothing to prove that Hinata is a good mom or bad mom. But again, my bigger point is that Hinata did come from a terrible parenting situation, even though she was the Hime and obviously living in the lap of luxury.
So why is Naruto automatically blamed as the neglectful dad because he grew up neglected himself...yet Hinata is supposed to be a good mom when she grew up neglected too?! And Hinata had it worse because she saw another sibling and cousin take a place of importance over her. Naruto didn't have parent issues — he was an orphan. But Hinata absolutely would have parent issues because she was intentionally overlooked.
Some of the most development Hinata has is about her treatment at the hands of her family. This is fact. Just because she's shown smiling with one child in the end doesn't mean that she's a good parent. In fact, with her known family background combined the present situation of Bolt's behavior issues, I would say that she's obviously doing something wrong.
After everything that's happened in the manga, I just don't have it in me to give Hinata the benefit of the doubt. If she weren't a cardboard cutout meant to stand in for whatever a fan wants to see in her, then she would have a full plate of emotional hurdles waiting for her as an adult: choosing a shinobi life or life as the clan leader, marrying for love rather for the clan's prosperity; deciding whether to end the cage seal and going against traditionalists if she chooses to; raising her children based on equality of skills rather than focusing on the ones who will bring honor to the clan.
All of these things should be Hinata's lot. But they're not. And I bet that in Part 3 Hinata will get a pass on all of it, including her flaws as a parent. Hinata will just be the happy little wife, while the blame for bad parenting gets lumped onto Naruto.
Last thing...you know who would not have these issues at all? That's right...Sakura. Great mom material, just like Kushina. Even Minato approves.
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Persona 5 hype 
