I just read that I tend toward your opinion, I think. It actually reminded me of one of my very favorite movies, Traffic, in the sense that all these stories come together and the main theme with which I'm left is that nothing is black and white, there are a million aspects to every story. And the way that everything that seems so big can really be broken down into tiny little pieces of relationships and mundanities of life. The way those things can just blow up on you at any time.
I thought the Japanese girl was amazing...that story just broke my heart. She essentially just kept getting rejected, over and over, even by her own mother in a sense. And the easiest and most obvious way to not get rejected was for her to get close to someone physically, and it KEPT HAPPENING because she was so misguided about it. The end with her father...oh god. Man.
All that said, the whole movie was just harrowing. I felt sick several times.