LIKES:
CAST: all well selected for their respective roles/characters.
Cinematography, colour palette, all perfect.
Sets, filming locations, all suited the episodes.
Wardrobe & set pieces were well done, even paying attention to the weirder things in the anime like the snail phones.
Production: had the budget to give the viewer the feel of the manga/anime.
Music/sound: all of it appropriate, added to the scenes. Voices of the actors never overpowered by the surrounding sounds or the music.
FX: creating Luffy’s stretch ability, blending the green screen into the settings, even simple blood from wounds all looked great.
Writing/Plot: the past of each crew member of the Straw Hats was well accomplished, even using flashbacks. I like how Sanji’s womanizing ways were more subtle, so he didn’t come across as creepy.
Directing:
Fighting choreography was great, including Usopp’s bombs.

DISLIKES:
Production:
Zooming in way too close to character faces, when it wasn’t necessary; to the point I could see their clogged pores from the makeup, etc.
Writing:
They crammed a lot of story arcs and incidents into just 8 episodes, causing some of the impact to be lost. It doesn’t follow the manga/anime format for everything, but managed not to stray too far from the main plot. Some of the characteristics of certain characters were left out, (probably due to time management and pacing), maybe it will show up in future episodes (Season 2).
Acting: not the best, but it will do, especially if you haven’t watched the anime or read the manga. [I have learned not to have high expectations for live adaptions.]
FX: I miss Usopp’s nose and Sanji’s eyebrow, both which could easily have been done. 'Lots of blood loss' wasn't really shown, probably so the children can watch it. Makeup was normally well done, but they caked it on a little thick for Nami sometimes. When they zoomed in too close on her, it was so obvious.

OVERALL:
I was pleasantly surprised at how well they made this adaption to live action and I’m glad they had the budget to pull it off. The cast was perfectly selected. I followed the manga, watched the anime and was initially biased, but now I want to see season 2. It will be a while before we get more, so I will definitely rewatch this. I recommend it, even to other One Piece fans, give it a chance. Anyone can watch it. It has made it as my second favourite live action adaption!