So I've watched it now over and over again and I must say, the picture quality is great. Even that dusty night shot where Mr. Black rips Stan's spine & skull out is really vivid and clear. When I came out of the cinema I thought the reason for me not understanding that scene was the bad editing, but actually it was the darkness the movie had in the cinema.
Getting to like this movie more and more now especially after seeing the Hanzo vs Falconer fight. Every move in the cinema seemed so hectic and uncontrolled, but on my TV it's just beautiful to look at and not even that bad choreographed.
Pity though there is no extended fight scene of the Classic vs Black showdown like that Imdb guy said (although I knew that he was talking bullcrap when he started to talk about that additional scene in the hunting camp... that was just so fanboyish). But even that fight is so nice to look at on the dvd, whereas on the cinema screen it again really looked like horrible editing.
So Ultimately I guess the lighting on the improved dvd quality really did the trick for me and makes it a better movie for me now, than it did when I watched it in the cinema.