When it comes to other people's ratings of movies (or albums etc) I tend to take it with a grain of salt. I'm really only interested in reviews if I like the writer and am curious to see their take on things. If it's a well written review then I can see how they came to their rating, even if I disagree vehemently.
I disagreed with Robert Ebert a lot, but I liked his writing and thought he had an interesting take on things.