i dont think its bad but its not good. if a snake sheds in one peice its a sign of good health, that i know. it could be that you dont have a humidity box or something to rub it off on but im not really sure.
A lot of times when the shed comes off in pieces it is a humidity issue. Misting, bathing or putting a humidity box in the cage often helps especially in the winter time when our houses are dry.