I'm trying to avoid the "really bad" Spagies, so I haven't experienced too much of the worst favourites, but if they are on TV I sometimes...
I have seen about half a dozen Fidanis, 2 were ... well, quite ok, not too bad.
But the others were terrible, so boring and so foreseeable, that I could only watch them by heavily using the fast forward button (God's most merciful invention).
My worst SW so far is at least a Fidani:
Django and Sartana are coming ... it's the End