I just went back to this thread because I had to add my thoughts...
WILD HONEY.
The song itself isn't bad, and in fact has a pretty rocking little track to it, but I think it's the worst (and most "forced") vocal Carl Wilson ever put on tape. The live versions featuring Blondie Chaplin are even worse. The lead vocal is so forced and grating that I cannot ever listen to this song.
You're right, though I don't find Blondie's performance as bad as Carl's studio vocal.
I never heard the greatness in this song, and it sounds so out of place on the Sounds Of Summer comp.