I know the feeling. I just bought Halo for Xbox off the Internet and about 5/10 times it won't load saying it isnt a xbox title/dvd/audio cd, but once I get it to work it plays fine (unless it craps out at the loading screen -- but that screen is rare). Emailed the company I bought it from and asked for information on returning the item. Not sure if I will yet cause it might not be worth the trouble since it does work after a few trys.
I've seen it loads of times here at work... I just use a knife and straighten them back out, but I can understand your concern when its for yourself, If i've got a problem with one, I can just use another and get this replaced, I suppose its not that easy for end user's.