My guess as to why some don't like this movie
The first 45 minutes had me sold, I was sure this was going to be one of the great ones. But then it drifted off in a direction I wasn't expecting. That's not always a bad thing, but in this case, I got annoyed with the mother-son relationship and by the end of the film I'd completely lost interest.
It's possible this is a me problem, but I've talked to many who feel the same way.