OP as a story is an N/A as far as complexity goes because it's not complete. But yes it's aimed at like a 10-14 year old crowd if that's what you mean.
What I meant was in regards to Midnight saying the fights suck. From a technical standpoint Oda is a high level graphic storyteller even if the story is pretty obvious... like he's not going to lose to Kaido as a final outcome, for example.