I have no problem with Luffy being born under a lucky star and being blessed. That's who he was from the get go. He was a member of the D. Clan and had access to a df which was incredibly rare outside of the grandline and more so in East Blue, the weakest of the 4 seas. This was already established in chapter 1.
Unlike Naruto or other shonen mcs, Luffy was already super strong upon introduction. He already possessed his own df, and "trained" himself from little to possess immense physical stats by the time he set out to sea. These were his own powers, and with it he was clapping everyone's cheeks in East Blue without too much trouble. He was never the underdog. He wasn't meant to be the typical hard working MC who was relatable. No, he was already blessed.
However, what I really don't enjoy about his character, and what has ultimately destroyed his character as many people and Major has pointed out is the inherited will/ child of prophecy bs.
Luffy was a man who set out to become PK not because he wanted to be the king of the world, or some sort of ruler. He set out because he wanted to become the freest man to have ever set sail.
However, all that has now gone right out of the window. Luffy's locked in a destiny forced to lick Roger's footsteps and become Joyboy 2.0, and his df will now be some ultimate bs Joyboy fruit too. He's not his own person no more. His actions are no longer his own choice since they're already all predetermined.
He's become the complete opposite of what he srands for. He's no longer free. My man is oppressed.
And that, is quite frankly disgusting. Probably a bigger 180 than even Ninja Jesus.