What this film is all about, why it's hated, and why I love it...
This will probably be a lengthy explanation, but here we go. There are three major reasons why this movie is amazing, and at the same time, why so many do not like it. These reasons are interconnected, so I'll probably repeat myself a lot.
1. The film is an impressionistic experience.
This is the most important. It seems like nobody understands this, then everybody gets angry because "what's with all the pretty pictures and no story" or "the characters were so underdeveloped and I didn't connect with any of them" or "this story is so bad and nonsensical." No, no, no. For those that don't know what "impressionistic" is, it means that the film tries to evoke unconscious emotions through its sights and sounds rather than through its story or characters. Most people go to a movie expecting a focus on the story, when in this case, the focus is on what you see, what you hear, and the impression that it leaves on you. Stop thinking about it, lie back, lower your defenses, and just let yourself experience it. You'll probably enjoy it much more.
2. The plot is not what this movie is about and therefore, not what you should be focusing on.
There is nothing to "get" in this film. This is not Inception. There are no hidden meanings or intellectual puzzles to solve. What's on the surface is everything the movie has to offer; some people just don't see it all because they're too busy trying to look past it. When people tell you that you don't "get it", they're not referring to some subtle and profound truth that us who like the film have somehow discovered. They just mean that you're watching the film wrong; you're looking for and expecting that which is irrelevant to this type of film. And therefore, you leave the movie unimpressed because what you were looking for was never even there in the first place. It's like going to a Disney movie expecting a horror film and then walking out halfway because it wasn't scary at all, and then going onto IMDB and rating it 1/10 because it didn't scare you.
3. This film ventures extremely far from traditional film making.
BUT IT IS STILL A FILM. It may be unorthodox and unlike other films, but that is not necessarily a bad thing. "Film" isn't some strict categorical term, it is a form of art. And all art forms have room for new ideas and new methods of creativity. Just look at how painting has changed over the years, or how drastically music has changed in just the past century. Impressionism isn't even a new concept, it's simply been uncommon in cinema because a narrative focus is a much more straightforward and accessible approach.
As for my opinion of the movie, I think it is a masterpiece and the best film ever made. The first time I saw it, I fell asleep thirty minutes in. When it was over, I was left underwhelmed. I thought there would be something more to it. But each time I watched it again, I found it more and more beautiful. I wasn't sure why, but I kept being drawn back to the film, and would watch specific moments again and again, unsure why or how it was making me feel how it was. And now, every shot takes my breath away, and I can understand and appreciate why. This really is a movie that you need to watch multiple times to fully appreciate.
Many point out how this movie is too pretentious, and it is pretentious if you watch it through a very cynical lens. But I've found that watching it with a more sincere attitude reveals how truly sincere the movie is as well. The emotions it evokes are as genuine as you allow them to be. As I said before, lower your defenses and you'll have a much better time. Some people can't stand the religious aspect of it. I'm an atheist, but I interpreted it more as a spiritual thing than a religious thing, and I'm much more comfortable with spirituality than I am with religion. And honestly, it's 1950s Texas, it would be weird if the characters weren't religious.
That's it for what I have to say about the Tree of Life. I've watched it countless times now, and will likely watch it countless times more.