I agree about the power.. One thing I do like about the show is it's realism.. It is going to be tough to colonize a whole new world. It will make the colonization of North America look like a picnic.
Mars will be tough to colonize based on the distance alone. Its going to take many decades of constant reliable resupply from earth. You can't really consider anyplace colonized till the people there can survive and feed themselves without assistance from earth. Mars also won't be colonized by 5, 10, or even 50 people. Its going to take hundreds or even thousands to create a mars based society with genetic diversity and diversity of skills.
None of it means it shouldn't happen.
Personally I wish we had spent the last 50 years colonizing the moon. In some ways its a much tougher nut to crack but necessity is the mother of invention and we would have a much bigger head start. Its a hard vacuum, even more exposed to the radioactive environment in space, a month long day/night cycle. However the proximity makes things like resupply much easier. I believe that if we had colonized the moon 30 years ago we would have already seen at least 1 manned mission to mars by now.