I used to do 2 "difficult" 5 guys. Both of them were in low shop areas. Both I would get good bonuses to do them. But the one I always had a trouble with. The last time I was there, the fries were bad, tasted bad and dark brown. From experience with an amusement park job, I told them in the report it was over the fry oil was not changed and needed it.
Needless to say, I am currently "banned" from shopping them and another burger shop with the same company. They claim I unassigned too often but I suspect, its over being too critical of their shops. I have found better shops to do with other companies.