The most Overrated/Underrated OP-Characters

[Oben]

This is how I see it, Mihawk is the better *Swordsman*, but Shanks is stronger *Overall*

I agree with this... seems the most likely.

As for the Yonkou debate, I think it's the following:
They have the four strongest pirate crews, not necessarily the four strongest individuals.
BUT: If they hadn't been extremely strong individuals, they'd never have gained the postition of Yonkou - hence it's likely they are also the top 4 in terms of strength.