well it depends if you want to watch it but its like everybody has said.
as for me well i watched it a couple of months ago now i am in Thriller bark so i am still a little far to where the japanese is at but i am getting there.
i mainly skipped some fillers that were not part of the main story like the Feudel japan one or Chopperman which i am planning to see some other time those fillers because i was in the middle of CP9 and i didn't want to brake the mood of that arc.
anyways about the Warship one well i can say this i watched it but didn't know it was a filler before but i know it ain't but watched it anyway, i thought the arc was ok till Eric the Whirlwind came in and thats when i kept watching more of the arc and got me hooked was Eric why well i think its because of his japanese voice actor.
for some reason when i heard Eric in japanese i heard Frieza and then it got me even more hooked, did anybody got that Eric in japanese is Frieza i thought it was awesome that he sounded like Frieza.