I have played a knockoff Zakk Wylde sig. and they are definitely cr@ppy. I can remember the one I played had loads of stupid stuff going on:
Knobs bunched wayy too close together
Humbucker pickup covers with only a very primitive looking single coil bar magnet pickup inside
The truss rod didn't actually work, broke out of place when we tried adjusting it and then just twisted around and did nothing.
The nut was plastic and really cr@ppy, uneven string spacings etc
hardware was the usual cheap chinese stuff you'd find on most starter guitars, not too bad TBH apart from the pickups.
The wiring was also pretty messy and looked like it was just made out of scr@ps.
The control and switch plates didn't fit properly and weren't even neat, looked like they were cut by hand.
The body and neck (apart from no truss rod) were actually pretty decent. Neat finish, all the binding was flush and neat etc. Frets were good enough, inlay was neat, routing was all pretty clean.
I dunno, I wouldn't pay good money for one but if someone was getting rid of one dead cheap and the truss-rod actually worked I'd be quite tempted to get it just as a beater, maybe replace the pickups and get a setup on it then pay it like it was stolen?