The actors playing the main heros do a pretty good job, but not great. Some do better than others. I expect roles like these are not easy to do especially for inexperienced actors, so I won't dole out any actual criticism. From what I understand of the manga, they definitely picked the right actors. They all have great potential and I'm looking forward to see them grow into the characters.

The actors playing the villians (and the peg leg chef) are absolutely fantastic! The series is worth watching just for them. But as much as they could easily dominate the scenes they're in, they deftly let the younger actors shine. That takes skill and professionalism.

The costumes, sets, makeup, and visuals are perfection. Especially the shark guys.

Definitley worth watching.