Yeah I saw the film years ago and I liked it. I can't remember too well, but maybe it was a bit sanctimonious in portraying Grey Owl as a noble environmentalist. I am sure he loved nature and had a good cause, but essentially I think of him as an adventurer and a showman who had no trouble deceiving people in order to make sure he had a good time.
In real life Grey Owl was apparently a bigamist so I think they played down that aspect too.