It's 19 chapters, and this is the ... 4th arc?

1)Starting (meeting Natsu)
2)Saving friend in mountain, those white gorilla's.
3)The weird book, destroying it bla bla with the fat flying man.
4)Now, the death Horn thingy.

They got to slow down, and make an arc truly worth noting about. I think they got a fantastic concept going with all the characters. But it needs some downtime to further explain the world in bite sizes.

Like other people said, I prefer not to compare it with One Piece, but One Piece in 19 chapters, I think Luffy's still trying to convince Zoro to join his crew (?) or is it first time they've met Buggy.