There is something really strange about the structure of this film: although Eastwood is definitively the leading man, he lacks of the ultimate motive to go after the bad guy. So the lead is somehow shared between Van Cleef, who has a real (and totally clear) motive to follow and Eastwood only being a facilitator for the greater mission of the guy. It works somehow, but I couldn't help the feeling that Eastwood (the actor) tried to minimize his lines and his impact on the story wherever he could - that could just be my own interpretation.
The title sequence is hilarious, even comic. There is an interesting quality to the lighting in most of the scenes - strong and hard kicks and sidelight - this visual style is more perfected in other films.