We are, to put it mildly, no fans of the colonization of Mars and instead we favor orbital space settlements. In the video below Simon Whistler of the TopTenz YouTube channel gives a nice summary of the challenges people will face on Mars.
It is not to say that orbital space habitats will be easy to build but given the particular difficulties Martian settlers will face, it will be the better alternative.
Of related interest: Interesting Engineering has an in depth article on the challenges of building human settlements on Mars.
Gunlord500 
Thanks for the reblog!