I have a nice pristine copy of Halo 3 now (thank you, Edelman!). But the same problem occurs — on the first loading point, the disc says it’s unreadable, yet multiplayer works fine. Guess that means it’s my 360’s drive going fritzy.
Maybe it’s time to give up and buy another console. I have never had to do that. I still have my launch PlayStation, my launch PS2, my launch Xbox, and pretty much my original hardware from every console I’ve ever owned. I am clearly due for some bad luck.