Watching this video would be pretty demoralizing if it weren't for the fact that I don't think it will be NASA colonizing Mars anyway.
https://www.sciencedaily.com/videos/71774ea647124133ad6e7b1f53a387a5.htm
Not exactly impressive considering what other groups have accomplished in robotics. I mean, a 300+lb robot that falls over while walking slowly over flat ground doesn't exactly inspire confidence.
Meanwhile SpaceX is getting ready to launch the Falcon Heavy
http://www.spacex.com/falcon-heavy
Don't get me wrong, I think what NASA has done is great. Without the information they've gathered about space and Mars, no private entity would have a chance. But if history is any guide (1500's and 1600's), it will be private enterprises that successfully establish colonies, not the government, in my opinion.