Josh Root , Nov 27, 2007; 06:56 p.m.
In general, I have had excellent results with costco and printing both digital and 35mm neg film. They pay their people well, train them properly, and refresh their chemicals regularly. It sounds to me like you just got one idiot.
And to be fair, I have not had good experiences having slides printed by any place other than a pro lab. Printing slides just seems more difficult for the average lab to master. Which in some respects is not surprising, given that printing from slides has to be significantly less than 1% of the business at a place like costco.