Someone else already said it.. but I'll reiterate. Every time a new game goes retail, especially a big one we get the report how this game doesn't read for them. (bound to always have a few bad in the batch, regardless of QC)
we also usually see "this game caused" this posts. RROD, lockups, etc.
non of this is new.. non of this is unique to Halo 3, or even Halo 3 regular edition disks.
While the game is the same across the 3 game sku's, we are bound to see "more" or these stories in the "regular" edition, simply because, that sku got the lion share of the disk. the other 2 sku's are not produced in the same quantities, not even close.
For a small few in this bunch of people reporting problems, they may, or will soon have to face the possibility that their beloved xbox is about to croak. In all likelihood totally unrelated to the loading of this game in their system, but little we, or anyone else will tell them will convince them otherwise given past history during these events.