No matter how many Madara trolls I see, it doesn't change the fact that he deserves all his praise. The moment he sent down meteors from the sky was the day his fans earned the right to say whatever they liked. Don't mind the few trolls that say he is greater than the SO6P, trolls will be trolls after all. However Madara is just the best and no one can dispute that.
Kakashi is hated because of Kamui as some people have stated. So his haters come up with BS excuses such as "chakra kills him", "food pills helped him", "it'd be out of character" and so on and so forth. Truth is Kishi messed up and underrated the over poweredness of Kakashi's MS when he first came up with it back in early shippuden. Now he nerfs it in battles because he knows logically all Kakashi's fights should last 2 seconds. It's the same with the substitution jutsu, it's a ridiculous jutsu that has no logic, Kishi just randomly uses it whenever he wants.
Minato's fan base is good, but when you get 50 threads a day of character bashing then of course his fans will retaliate and get defensive. And sometimes those fans will go a little overboard defending him and overrate him a little, including myself. But at the end of the day, most the Minato diputes I see are caused by other fan bases. If no one said anything about Minato, he'd still be one of the most loved characters. Actually Minato is one of the most loved characters, it's just NB that doesn't like him.
Hiruzen feels like every single one of his fans are trolls, I don't even respond to them anymore because it's a waste of time. Kishi clearly changed his mind about Hiruzen and I think a lot of his fans are starting to realize that. Their fans used to be worse, but since his display on the battlefield that has changed. The 5 elemental nature attack he did was a phenomenal, but barely makes up for his performance.