There's no way it's a bad disc. Every disc is exactly identical. You could get scratches on it, but even then it wouldn't cause the problems you're describing.
That pop-in is there for everybody. The IGN review criticizes the game quite a bit for, whereas most other reviewers ignore it, I guess. But yeah, it's supposed to be bad, so I'm not surprised by what you describe.
This Suda dude didn't polish this turd too well.