True. They are currently functioning under the premise that Titan society is fully functioning underground that the ruins remain on the surface. Of course, this is a clear retcon/revamp since there are past issues that show Titan society functioning on the surface (spaceships are shown looking down on them).
And yes, Ewing is knocking both books out of the park. He is now my current favorite writer and should be the one leading Marvel's cosmics.
I agree on all counts. Ultimates2 is my favorite Marvel book and Ewings respect for the source material and what came before him is obvious.