Two reactions: I am sobbing, quietly, at the fact that this is so far from the actual book and that it's highly unlikely that another, truer, film will be made. Who knows, maybe if there is enough "but it's not the book and the book would make a damn fine film" reaction, there may be hope. Personally, I think it would work better as a miniseries.
And, to be honest, if I was seeing this and it was not titled "The Dark Is Rising" -- if I knew nothing and was shown a trailer for "Fight For the Light" or "Seek the Signs" or some such nonsense -- I'd be thinking, hmm, that looks interesting.
What are your thoughts?