I judge a book by its cover when it comes to experiences.
I'm not sure what you mean here, but do you think it's okay to be judgmental like that?
Being judgmental means that you learn from mistakes and the failures of others
It can be fair to make some broad assumptions about things  based on the past experiences of others. Learning from those who came before us is a big part of what makes humans unique. It'd be foolish to ignore all that information!
I agree I try to avoid the things that went poorly for others.
Sounds like you've got a really good strategy. It's great to avoid experience that you know will go poorly, but try to take some risks too.