Why do so many people think Joe Burrow will be great in the NFL?

No this isn't meant to be an anti Joe Burrow thread. I think he has done great at LSU and deserves to be a high 1st round pick. But why is everyone so sure he will light it up in the NFL? Yes, he played in a spread offense similar to the Saints but he also had great playmakers around him. Will he have that with the team that drafts him? And why do so many people think the Saints would mortgage everything to obtain Burrow? I just don't see it. I want Joe Burrow to succeed and would love if somehow he became a Saint. But not at the cost of destroying a team that just won 13 games.
I could see him wind up like Joe Montana.
I could also see him wind up like Jay Cutler.
I didn't think he's anymore valuable than a top ranked QB from any other year. I don't see game changer like a Mike Vick but I don't see a bust either.