I saw this the other night, and I loved it. There is a pretense for a plot, but that gets thrown out the window, with only a minor attempt to keep it in the movie.
Don't go to see this movie for plot, or for great acting. Go and see it for Samuel Jackson, and for Mutha fucking snakes on a mutha fucking plane.
Uh...had a slight weapons malfunction. But, uh, everything's perfectly all right now. We're fine. We're all fine here, now, thank you. How are you?