Having a warranty and having people who will work on it are quite different. Wally-mart will throw a bike together 100% it will be thrown together with the lowest quality parts and the support will be zero maybe they can replace it but I doubt they will do that more than once if at all.

Anytime you have a lot of bike that means added price or lowered quality and lowered quality is never good. For a bike from a box store that isn't a bike shop you want the simplest machine possible or you want that price to be sky high and to be matched in quality and support.