I read most of the Newsweek article that concluded that the film was anti-Semitic and their reasons are ridiculous. The central one I remember is that Pilate is portrayed with a good side, but Caiaphus isn't. I don't quite understand how that's anti-Semitic.
I think Gibson will have done a good job if he presents a film that's firmly neither anti- nor philo-Semitic, but open to having it be interpreted in a lot of different ways. That's the strength of the Bible, and just like the Bible, you can only see it as anti-Semitic if you yourself are already anti-Semitic and want to find a text to justify your anti-Semitism. Certainly, I think most people nowadays interpret the "Let our sins be upon us and our children" line to be condemning HUMANITY, not Jews.
I do need to see the film, and also finish the Newsweek article, before I heartily defend or attack it, though.