Good Blu Ray movies vs. poor blu ray movies

[jaymzbo]

I am trying to educate myself on how to tell by looking at the specs of a blu ray movie if it will be have stunning PQ or not. Does it have to do with the amount of space it occupies on the disc? What is this bitrate I keep reading about?

I usually choose movies based on content alone but don't want to buy one of noticeable lesser quality. For example, I know the Fifth Element is being remastered. Would one have been able to discern if the first one was not a good transfer based on the listed specs?

If someone could explain this to me (in simple layman terms) or direct me to a thread/link that explains it, I would certainly appreciate it.