I always thought Ultimate Sin was underrated. I think even Ozzy doesn't even like it much from what I recall, but I like most of the tunes on it. Shot in the Dark is particularly awesome.
The Ultimate Sin is my second favorite Ozzy album. I have no idea why Ozzy hates this album so much, but it can't be due to the music. I'm guessing it's some sort of underlying reason maybe to do with Jake E Lee or something.
I have The Ultimate Ozzy converted over to DVD if you ever want me to burn a copy for you. It's a great show! As far as I know, it's only been released officially on VHS, so it's long, long out of print.
~Brian~