One Piece regularly gets it from the fandom for its animation outside of a few key moments. It has consistently decent looking episodes, but no one who is a fan of the anime would call it consistently decent looking great, unless you're comparing it to Super.
Episode 67 was presentable with some ugly faces, which One Piece some time have too. Even then, it isn't like before where you really would get some really ugly episodes back-to-back. Which is why I say overall Super is getting consistently decent looking episodes. Asking for consistently great when One Piece doesn't even have that is pie in the sky.
That wasn't filler, he said that in the manga. Specifically, he couldn't keep up with the Saiyans.