I think it depends on which you focus on, or if you do the series as a whole. I never got to finish the last book, but throughout the series there is the issue of severing ties from earth and founding a new type of society, and one of the main proponents of this is a doctor of the main cast. Their ideas could be vague at times, but eventually crystallized into something coherent. Another issue is colonialism, and the way earth interacts with the Martians. There's also environmental concerns that get brought up a few times.
If the Mars trilogy doesn't pan out, I could recommend the other book 2312 by the same author. The politics in that book are much more of the focus and central issue.



