She got more importance as Naruto because Naruto finally focused on her. Through out the series who ever he focused on they got more importance than anyone. Just see it as another arc.
Seeing it is better than reading it. That is why you read a manga with pictures and words.
After watching this movie I can safely say that the wordings people used to tell about this movie was overexagerated. The movie did not seem as misplaced as the spoilers were saying it was. Also the majority of the hate was because of lack of Sasuke. If you only read this series just for Sasuke and not other characters like Sai, Ino, Sakura, and Shikamaru you are better off skipping the whole manga and reading manga panels of just him. Because some of these characters played a part to in this movie. Hell even Kakashi got loads of respect by having a good intuation.
The other movies were not canon so it didn't matter. You are skipping a canon movie just because you don't find interest in Naruto and Hinata. I could personally care less your loss.
I already did and I can easily tell you that the only thing that is holding you back is yourself. And your opinion about the movie has no effect on what was presented. Even though I am a NaruHina fan I watched it as a neutral. I was waiting for things to get bad or feel awkward. But none of that happen. Everything went smoothly.
I am not saying you need to watch the movie. But if it really does not interest you than there is no need for you to give your opinions on it.