I read The Mars Trilogy since it loiters near the top of most of the lists of great sci-fi novels I've encountered. This is mostly a "me too, +1" review.
The three books follow the fortunes of the "First Hundred" Mars colonists. There is plenty of hard structural and terraforming science, and much exploration of the social and political fall-out of founding a separated human world, but it shines as a story about fascinating people and their lengthened lives.
As I read, my simplifying pattern-matching machinery decided "this is Deadwood in space", and it is a strong enough analogy I think that, with enough love and skill, a TV adaptation could work - despite understandable concerns to the contrary.
Review: Red Mars, Green Mars, Blue Mars
The Mars Trilogy (Red Mars, Blue Mars, Green Mars) by Kim Stanley Robinson