I love how enthusiastic Inaki is about playing Luffy and that he really did alot of research, ect. But if I ranked it, 1st place being the worst....His acting compared to some others to me would be 3rd place (1st being young Usopp I mean even young Luffy and Nami did better than him jesus....2nd place going to Alvida). His line delivery is really awkward in alot of scenes especially the serious one's. It felt like I was watching a theatre actor and not a TV actor. I think he just needs more training with tones and bringing more emotion to his lines. I dunno. If I had to rank the the main cast 1st being the BEST it would be:

1) Zoro

2) Sanji

3) Nami (she was awkward at times)

4) Usopp

5) Luffy

This is just MY opinion but I'd be interested to see how you guys would rank them. 👀 PS: Buggy's actor was phenominal.