User blog comment:D.Dragon123/Why Haoshoku haki is useless./@comment-4156018-20130114215331

Haoshoku Haki isn't just some lame ability that can overthrow weak minds. It's the ability to, with pure willpower, destabilize every mind that is not stronger than the willpower that has been put on it. With a strong enough Haoshoku, you can truly be the king of seas. All you have to do is stand still and use your ability like a boss to overthrow anyone. The Haoshoku has the potential conquering anybody and should not be taken lightly. Luffy's Haoshoku is yet very weak since he only trained for two years but imagine when he has trained it to its fullest, even the strong enemies might stagger or even lose control.

It's like you're given a weapon of a whole new kind. Imagine when Luffy got really pissed at Lucci in Water 7 and couldn't do shit about it because his physical strength wasn't enough, even though his willpower was on the top. Now he can utilize that willpower. That's why it's called the Conqueror's Haki.