The one thing that the film did right by was the character of River. Kaylee wasn't the same, I thought she was too thin. They tried to incorporate a lot of the themes from the show such as the Kaylee/Simon relationship but not as well as the show did. Overall plot was good, it just seemed like a really long episode of the show that killed off too many characters and just left the Browncoat audience unsatisfied. Again, it might be down to high expectations though. Rent, borrow, or otherwise see the series NOW. You won't regret it.