The worst WSOP final table ever was either 2002 or 2005.
2002 top seven:
Robert Varkonyi
Julian Gardner
Ralph Perry
Scott Gray
Harley Hall
Russell Rosenbloom
John Shipley
2005 top seven:
Joseph Hachem
Steve Dannenmann
John Barch
Aaron Kanter
Andrew Black
Scott Lazaar
Daniel Bergsdorf
I challenge you to find a worse WSOP final tables than these two.
Here is a link where the final table finishers are listed.