firefly is one of the best SF series i've seen (THE best beeing battlestar galactica).
firefly is wierd because you never know what to expect next, not (only) in terms of story-line, but more like: one show is hilarious, the one after is depressing, then follow the 2 grimm episodes, and than again one light hearted, but it did not seem -out-of-place- to me, it kinda functions ok.
only negative side i can remember is it beeing too short.
battlestar galactica (the new series) is my favourite, because it's more serious than any other, it does not favour any side, there is no good guys and bad guys, there are just warring sides, each with it's own best and worst.
while firefly is an SF western (
), battlestar has more epic touch to it, with a strong focus on individuals and their lives. AND it has more episodes than firefly, and it does not seem they will stop any time soon (and by the third season it has still not shown any signs of over-exploatation)
serenity is not as good as firefly series to mee, but it's ok, considering the productional uncertanty...
p.s. it's early in the morning, that's why i'm so long-winded.