Comrade!
I loved the series and the movie was great. If you haven't rented or bought the DVD set of the series, you need to go do that immediately. There were two or three episodes that were never aired, and they are some of the best episodes. Also, the order in the DVD set makes more sense (as it follows Joss Whedon's vision for telling the story) than the order in which the episodes aired on Fox. I think my favorite line from the whole series was this one:
Mal: "Well, I gotta tell ya Jayne, my days of not taking you seriously are definitely comin' to a middle."