Every spiritual teacher who arises comes out of a particular tradition and a specific culture. The Muslim prophet Muhammad came out of his own particular middle eastern society. Within that milieu, he attempted to give a framework of teachings that would allow people to live a more ethical life so in most instances he is a good role model.
Seriously he had sex with a nine year old if the Hadith are correct. I don't think pedophilia is a good role model to anyone. Also he was in charge of organizing raids to capture goods from caravans, so a mob boss mentality is not a trait I would expect from a good role model.
The Muslim Prophet Muhammad has some really good advice so I can see where some could view him as a good role model. In my opinion though, he longs for too much violence, he is constantly wanting others to be killed, tortured, or maimed for their doings and beliefs. I can't find a person who teaches and asks for things like that a good role model for anyone.