People dislike Minato? I initially thought he was cool, and grew to love him. The way he was depicted during the nine tales' incident was badass. His intelligence and style when he battles is what I like the most about him. He was able to analyze and perfectly counter Obito's intangibility from only a few exchanges. The way he fights with FTG is pure eye candy to me. He remains completely calm and focused during any fight, like when he casually tossed his FTG kunai to avoid A's lightning straight, and proceeded to take complete control of the battlefield without any tension visible on his face whatsoever.
His personality is what i imagine most people have an issue with. His character doesn't have as much depth compared to other popular characters. He is essentially just depicted as an exceptionally skilled, kind, and dependable Dad who never drops his composure. He has a quirk of giving horrible names to new jutsu, but while it is funny it doesn't really expand on him as a person very much. Despite his lack of depth, I still love him for his cool factor though lol.