Marko has his good points and bad points. He was a good racer in his time, and indeed was a friend of Rindt. Despite losing sight in one eye after a racing accident in 1972, he has continued to love the sport and guide young talent to the top, as he has with Vettel.
That said, he has also been very protective of Vettel, to the point where it has affected the team’s objectiveness with Vettel and Webber as its drivers. He has also said some silly things in the press, most notably after that mess in Turkey, and has done well to keep quiet since.
He’s human like the rest of us. Love him or hate him for who he is.
Personally, I don’t dislike the guy, but I’m not a fan of his Vettel fanboy status, either. With Vettel World Champion now, I honestly think Marko shouldn’t intervene in Vettel’s affairs (or the team’s affairs, in fact) as much now.