I saw it at a Sunday Matinee, and I would have really enjoyed the movie, but it was so depressing.
Part of what made the movie good IMO. You have this guy doing whatever it takes to protect his sister, and the crew of the Serenity up against a sadist who is hell-bent on getting River back, and of course the Reavers as well. Raw emotion. It was not suger-coated like a lot of hollywood movies.