I've yet to see filler from any show that wasn't good.
How ironic because I've never seen filler that is good. And yes I have seen G8 and good isn't a word I'd use to describe it. Most people call it the best of OP's filler but that is an over exaggeration, it's just OP's least sh*tty filler. It's borning, trit and has no pay off (what's the point of building up Captain John to be powerful only to have no fight at all?) and like all filler there is a pointless Sanji cooking episode. It's like the Toei writers pay no real attention to the canon episodes so when it comes time to write the filler they just make all the characters into generic clones based on their "job". Oh Sanji is cook so he has to cook, Usopp makes stuff so let's have him make fireworks, oh Robin loves to read so lets have her read all the time. The filler boils down to two types typically: Filler about helping little kids with some retarded task or helping old people with some retarded task or both and the Marines often end up being the generic bad guys. I've never seen a filler that even comes close to being as good as the canon (especially those insanly stupid Detective Luffy episodes, whose f**king idea was that s**t?).
But the fillers in One Piece are brilliant.
Hahahaha, noooooooooo, I think you need to look up the definition of brilliant because they are most certainly not. Derivative, pointless and out of character, yes, but brilliant, no. If I ever see a filler that is at least adequate, I'll reconsider my stance, but as it is, all of OP's filler ranges from mediocre to eye bleedingly bad.