I beg to disagree. I have many frienRAB who went to see this not even knowing about Firefly and enjoyed it immensely. Some even went on to buy the original TV series boxset.
I found it made more sense than any of the recent Star Wars films and I've watched all of the first trilogy many times.
yes i really rate it and would recomend giving it a view, loved looking for all the little things in it like they have a smug not smeg fridge. very funny film and suits all ages.