Blu-ray titles you regret buying

[elmuth]

First, this is not about the lack of quality but about too much!
When I saw 28 days later in the movie theater, I was scared to death. It was awesome and blew me away. It came out on Blu Ray. I grabbed it since it was on sale for 30% off. Not a bad deal. I was disappointed that the picture wasn't much to shout about. I'm kicking myself since I forgot that they deliberately shot it with cameras that gave a documentary feel.
Also, for some reason, I think 30 days of night would have looked better with a slightly grainer picture. I also have it on Blu Ray. Still, it was a great horror film.
Some movies, honestly, are best left alone. Can you name any? I'm curious as to what other titles are better on the previous format.