Why do so many BD's look SO BAD???

[popoboy]

Can someone please explain to me why some BD's look so amazing and others look so bad? I have been buying movies for 5 years and am just tired of expecting them to look good and then being sadly disappointed...I know the basic answers about how much the studio is willing to spend on mastering etc...(and I mainly buy classic and retro movies) But it's SO hit and miss...I just purchased "Bedknobs and Broomsticks" I've been waiting for years for this to be released. Saw it recently on an HD station and it looked great. Then I got the BD last week and it looks AWFUL...It looks like it's been rolled in sand, grain everywhere, mosquito noise, poor coloring...I mean Disney truly screwed this one up (lets not even mention the fact that the didn't include the longer version of the film) This isn't the first time I've noticed this...A few years ago I saw a beautiful HD showing of "West Side Story" and then purchased the BD...Again...weird colors, telecine wobble, and the blu ray just looked terrible next to the HD broadcast. WHY IS THIS??? Can someone please explain? I'm about ready to give up on Blu ray...and I hate to say this but each time I buy a catalog title I'm less and less impressed. And please, for all you younger out there, please don't tell me that this is the way an older film is SUPPOSED to look because that just isn't true..Let's remember that many of us saw these films multiple times on first release and remember how they looked...and they DID NOT LOOK LIKE A GRAINY MESS. Let's not forget that a film projected on a huge screen might show some grain, but scaled down onto a 55 inch TV should not show the grain...it should be very minimal...and also I'm tired of hearing that the director intended the grain...This is ALSO not true (unless it is a film like Fight Club) These older films were simply the result of film stocks of the time...nothing more...Disenchanted with Blu ray.....