What's wrong they used electrical tape, not Duct tape!!!
This is the kind of stuff people do that really scares me !!! They must have asked Bob at that Home store.
Looking at the MC it looks to be 12 or 14 A.G., I can't tell if the other end is Romex or the end of an extension cord. Either way I doubt if that Red wire nut is much good if one end is 14 AWG and the other is 16 AWG stranded. The worst thing is that for less than $5.00 it could be safe and legal.
