Well i can't really give an educated vote as to the "worst" out there, I have only used a local shop near me in New Jersey for my purchases and services. I have bought some things from Cabellas "on-line" or some great sale items from Dicks Sporting goods, but never had to deal with any live people. But i will tell you that the local "little guy" sporting goods store I use has been one of the BEST.
Simon Peter Sporting Goods in Newton NJ for those of you who want quality products, both new and used guns and bows, fair prices equal to the "chain" stores, and service from the employees that cant be matched. Everyone there is knowedgable in one thing or another, and if you ask for help, you will be sure to get the right advice.
So i'll continue to shop and maintain my equipment there, and hopefully i never have to vote "THE WORST" store out there.