This always seems to get people exited...
My view is that "It depends on the PPL". Boeing / Airbus drivers are not Gods - they have, however, a great deal of instruction and experience that your average PPL does not have.
On the other hand I would not bet on the majority of ATPLs being able to land a Tiger Moth, or even my glider, without breaking the aeroplane and, likely, themselves.
"Horses for Courses" as the saying goes
OC619
P.S. When I added an airline captain to my glider insurance a couple of years ago my broker suggested we just include his gliding time - apparently mentioning that the airline bit would, probably, increase the premium.