Well, coming from 5 years in the future i can tell that actually Niou is busted as fuck seeing how he copied Byodoin (world tech and pirate spirit), Zeus, Noah and Camus, lets enphasize CAMUS (captain of world Nº3 country and a pro) and is driving 2 pros to the wall (even though i think he can't reach 100% of Camus lv, maybe around 70%-80% ?)
Now, I read all this discussion and based on what i saw:
Underrated:
- Gin (he's MSr Nº1 power player)
- Kite (Kite only weakness is knocking the racket off his hands after the multiple rackets power up)
- Oishi (as a single player he's useless but he's a double genius)
- Marui (his weakness is pure strenght to break his defense but if he has someone to defend and focus on attacking he can pretty much form an invincible double)
Overrated:
- All Seigaku
- Tanegashima (he was getting stomped by Zeus and that make us think, what he got beside being able to return any special shot ? Would he be able to beat Tokugawa who isn't full of offensive shots ?)
- Byodoin (in this case i guess people think we haven't seen everything he can do because if we did, he's in a close level to Tokugawa and Niou copying him took a beating from the 2 pros of Germany, so there's no way he can beat Volk 1v1, probably just like Tokugawa did get some games. But maybe he can beat Amadeus since he lost to USA cap and Medanore because even tough he has higher potencial he's objectively weaker than Volk)