I saw Serenity today. I’m not gonna talk about it too much; suffice to say it was really good, and everyone should go see it. Even if you haven’t seen all of (or any) Firefly you’ll probably still like it, and you shouldn’t be too confused on account of all the main plot points being explained at the beginning (they managed to do this in a novel and unobtrusive way, which I appreciate). I don’t think it would be possible for them to make a better Firefly movie (either in terms of truth to the series or of general quality as a movie), which is great for this movie (obviously), but I think it may be hard for them to follow up on it in the future (either in a sequel or in a continuation of the series).
I had gotten a bit of a non-specific spoiler beforehand from an early review in aother blog I read, but even with that I was still really shocked at certain twists the plot took. If you want a more in-depth review, I suggest reading that one, assuming you don’t mind unlabeled non-specific spoilers.
Oh, and before you go see it, you may want to read this poem, which is mentioned in the movie (also, it is kinda interesting). :)