The red/blue/green mars trilogy. The first book was pretty great and the themes were good throughout but the main characters devolve into this weird privaliged manifest destiny hippy cult that doesn’t give a shit about the rest of humanity and acts like they got to mars all by themselves and not on the backs of the billions supporting the economies that made the journey possible.

Its the only serie series I’ve read where I ended up rooting for the oligarchic corporate overlords because even a mars owned by megacorps works out better for humanity than the mars envisioned by the protagonists at this point who are basically turning into a kind of proto-version of the spacers from asimov.