The last few HP movies were criticized by many for being too dark, even on Blu-ray and in theatres. Ex:
http://www.avsforum.com/t/1201418/harry ... t_17640353As for fuzziness, a lot of big studio DVD releases produced after Blu-ray was introduced seem to be softer than they should be. Depending on how conspiracy-minded you are it's either intentionally trying to push people to upgrade, or a lack of effort since the videophiles already have the BD copy anyway.