Luffy has trained with his Gear Second for 2 years :|
And how often has he used it in anime? Twice. And neither times has he used it for more than 10 seconds. He isn't like Ichigo who spams Bankai in every fight but still gets owned or Naruto who doesn't even know what hes doing >.>
Luffy at least handles his business quickly.
He has gotten smarter too, hasn't he? He quickly got out of the way so that the other guy with the net wouldn't capture sanji and the rest of the guys. When he hit those three, I was like wtf? That was sooo fast