It's your fault if you didn't ask him to send you new ones. If you buy bad products you take them back, don't you? He has master copies of those games so there's no reason he can't make perfect copies. Maybe it's your VCR or DVD player? Maybe the tapes were bad? Whatever the reason, I know for a fact he guarantees his work.
K-Rob, get the tapes you want and you'll be happy. I get stuff from the guy all the time and there are never problems. If there were, I'd get them resolved instead of watching bad tapes.