Mine has no rot either. In the end I'm not sure it matters as this disc is super common. Even if %10 of them are rotted it still isn't going to be hard to find one of the %90. Even if half of them were rotten you'd still be able to find one. We'll never run out of this or Red October or Robin Hood: Prince of Thieves or Terminator 2.

Overall I'd say at least %50 of the time the person reporting the "rot" doesn't know how to identity if. Most people group any and all defects as "rot". This movie is a more casual movie goers choice too so figure an even less informed survey than average.