I worked with someone who had been imprisoned by him. He was lucky to get out of Chile alive (a Priest who worked for human rights there). In fact, the organization I was working with he ran - and what we did was run a network that helped get people who's lives were in danger because of their political activity escape countries like Chile, Nicaragua, El Salvador, Guatemala and Honduras.
Pinochet was a criminal and it's a shame he never had to face justice for his crimes.
And saving the country from Marxism? First, Allende was democratically elected. If I remember correctly, he was the 2nd socialist ever to be elected to office. Second, he was a social democrat, not a communist (the implication of the word "Marxist.").
And Pinochet was charged with the disappearance of 2 people? That in and of itself is a crime.