I expected some profound analysis, but it's just the standard "I don't like it so it's bad literature"- only on steroids. Because this time it's "I am a writer myself so I know what's good or bad"

No, the fact that you didn't like it doesn't mean it's quality is bad. It means it doesn't fit your taste, that's all. And that's okay. The world would be unbearably dull if we all liked all the same things.

For example, the 'improvements' you suggested would completely ruin the book for me, taking out everything that makes it unique and turning it into a standard multi-pov story.

So, to each their own. Live and let live, and so on. :)