Edit: Not sure if this is just me, but thought I would post it least it was an as yet unidentified issue.

6 hours in, taking things nice and slowly, and I now receive a corrupted game-save message. This is not on all game-saves - only on the auto save. Not had this issue previously on any other game - even on Fall Out LV .It could of course be a hard-drive issue on my xbox slim (120 gig), and I might reformat drive.

If anyone else has encountered this I would be interested to know.