That's why I never buy downloadable. Something all too often goes wonky. May not be ND's fault though.... with a downloadable title it could any number of issues. Maybe even that you have poor internet and it got corrupted during download cuz you have a bad connection? But it's easy to point fingers.
Disc based is still the way to go. Especially with a title of this caliber that will tax the system.
i have a hard copy and on first loading of SP, game froze. had to unplug ps3 and plug back in.
So i just disconnected from the internet and it loaded and played fine.