I think for pre-war the strip card sets W515, W551, etc. are pretty bad. They look like they were drawn by a child -- the likeness is questionable on some of them. Top that off with the fact that many are blank back and were actually cut by children.
Worst set of all time, though, has to be the yellow 1990 Score. Oh wait, the 1981 Fleer was pretty awful with the out-of-focus photographs.
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