Forum:The shichibukai

what do you guys think of the shichibukai? to tell the truth,they don't actually seem all that powerful for one of the 3 great powers of the one piece world.The only shichibukai that's actually powerful is mihawk since he can beat up one of the 4 yonkos (shanks)(he was on par with shanks until shanks lost his arm,now he's most definitely more powerful).All of the other shichibukai really don't seem like much of a threat except for doflamingo whom we really never got to see the full potential of.So really, my thoughts of the shichibukai are that they're really not that great... either that... or luffy just too awesome.Also... why the hell haven't the world government give luffy an invitation to become a shichibukai?he's spoken of on a legendary level... like come on world government!