This isn't like skydiving, or something. I don't think you need moral support to help you try and get into Opeth. You don't need people to help you out with this (maybe just the Korn thing, and that may need some professional help). Either listen or don't.
Why do you need ADVICE to get into a certain band, anyway? Other people don't have your ears. All they can say is they like it or don't. And if you come HERE asking, guess what THAT answer will be?
I think Opeth is one of the greatest bands on the planet. Their music is some of the most intelligent and complex out there, and there's almost no limit to what it has to offer. In fact, everytime I listen to a particular song, I'll find something new. Could be something as subtle as 1 chord I didn't realize the last time I heard that particular song, or it could be a certain emotion or mood. Could be anything, really. In short, their amazing!
So make up your OWN mind. Listen or don't.
I don't have your ears either, because frankly I think Korn is Krap!