Nice effects, reasonably good actors, suspense. Good effects.
Though it can't be more than 3 for its contained silliness. Following the original book by Alexandre Dumas pretty closely, there is just additional witch-craft crap throughout the movie. I wonder if it might have been added to play with effects?
In any case, this brings down an otherwise good movie to a rather ridiculous level. While Lady Winter has a lot of potential given to her by the plot in the book, giving her supernatural to diabolic powers in the movie makes little sense, and rather distort the circles that she could have drawn around Richelieu, Buckingham, d'Artagnan.