Haki's always been there. Its been there since Skypiea days. So it was bound to get more importance sooner or later. I, for one, like it. At least everyone's on a level play-field now. No more logias-are-invincible bull. Red Hawk was okay as a tribute to Ace. I love Elephant Gattling and Grizzly Magnum.
Well, for Luffy to stand among the greatest pirates by the time the series comes to an end...he'll have to get over-the-top moves like those. Powers will have a massive scale by the time we reach end of the series. Though it will never reach DBZ levels, I'm sure.