User blog comment:Keekian/Will OP be better if Luffy was smarter?/@comment-175.177.4.40-20170426051327

Some luffy's stupids which grinds my gear: He didn't know Dragon name until Robin explain to him, he didn't know what happen during 2 year timeskip (payback war), and so on.

But for man common sense, he is one of the best (shown at Jaya, Alabasta, Enies Lobby, etc). IMO.