Halo 3: Complete Multiplayer Experience Issues

Halo 3: Complete Multiplayer Experience, the Halo 3 map pack disc included with Halo 3: ODST, causes the fans of my Xbox 360 to kick in way louder than any other game even when it isn’t being played. The fans immediately settle down as soon as I open the disc tray.

The disc isn’t scratched, but there are some splotchy patterns on the bottom of the disc. I saw the background to the menu of the game become corrupted once, but it otherwise plays without issue. Has anyone here seen that happen before? I got the game used, so perhaps the previous owner left it open near the heat of the sun or something?