Indeed. One Piece's story and art are both good at first, then after East Blue it peaks during Alabasta/Skypiea, slowly declines during CP9/Whitebeard, and takes a big nosedive during Part II.
Yamcha lost the first rounds in the 21st, 22nd, and 23rd Tenkaichi Budokais, was the first death against the Saiyans (against a Saibaman, at that), and almost died against Doctor Gero and was again the first casualty in the battlefield. Meanwhile, he did nothing against the Red Ribbon Army...
Piccolo's end goal was to take over the world, and he wanted to take advantage of Gohan's latent power to eliminate the Saiyans because they were a threat to that goal.
I legit think most of the Kuririn hate stems from his awful English Dub lines in Z. Dubtards would trash Kuririn any chance they got because of this, while ignoring some of Yamcha's blatant mediocrity.
The only one I thought would join that didn't was Vivi, as well...
I also thought someone from Skypiea should have joined, like Wyper. That would have been awesome.