I don't care because we know he trained to get where he is.
I don't understand this kind of critics, "his ancestors this, his ancestors that, his father this, his grandfather that", when you see the guy training and progressing through his own efforts and battles, his genetics isn't predominant in his achievements.
This goes for Zoro and every other character. If you don't train hard, you won't accomplish anything, that's how I see it in One Piece until proven otherwise