You are just saying exactly what everyone says without any context. What destroys Naruto's character, how is he OOC, what is hinata's forshadowing? You are stating results, but I don't understand how you are getting to them.
I will give you context then
+Naruto's character, emotional knowledge is a known factor that he has, it's present durign the whole manga, he is in touch with his emotions and empathizes easily with people, that's one thing that made him different to other shonen protagonists like Goku
If you want proof, just look at Naruto's confrontation with Zabuza at the bridge, or with Gaara, or with Sasuke, or with Sakura during the POAL, his confrontation with Dark Naruto.
During the last this was just completely forgotten/ erased and they made Naruto's emotional knowledge that of a small kid, all of this because they had to find a excuse as to why did Naruto didn't addressed Hinata's blatant confession, the best way they could find was to make him an emotional retard that confused her love to love for food. This is a retcon that damaged one of the MC main characteristcs.
+How he is OOC?
Its simple, after Hinata is taken (and after a brief confrontation), Naruto simply gives up, he gives up on everything, the world, his friends, everything and all of this because he was down because Hinata basically rejected him 
Now don't get me wrong, the error isn't on Naruto giving up per see,the error is on why he gave up like that, the excuse was too weak. A IC Naruto would do everything to go after Hinata and demand explanation like he did with Sasuke, not once he actually gave up on Sasuke not even during the times Sasuke was actually crazy
That's why this scene makes him OOC and the japanes began to call him scumbag.
+ Hinata going back on her development
We all know HInata is pretty much a static character, her only development in part 2 is bound to Naruto, which is a shame. However the worst thing is that even this little development she had was screwed upon
Remember that at war arc she said she would begin to walk close to him and things like that, here she vowed she would stand by his side? Well in the movie mainly at the beginning what we saw was just the pitful Hinata from the beginning of part 2, incapable of handling herself around Naruto and going against her hinted foreshadowing
+Corrupted plot theme
You didn't ask me for this one but I will detail it anyway
The destiny plot theme was introduced in part 1 in the Neji vs Hinata fight, then it was corrupted in part 2 with all the chosen one, reincarnation BS. The last hurt this even more by making Hinata "the byakugan princess", the one destined to end Toneri's lame ambitions