It was very interesting to see how they did this.
It points to a problem with TG2. That Wadi Rum place is re-creatable in TG2 without even importing terrain. Unless you need it to be exactly that terrain. The problem in doing this is that initially you have a concept like the one Ridley Scott had but to recreate this completely in TG2 requires a lot of technical tweakery and know how for the terrain hence they don't use TG2. Easier to just build a stage set in a standard 3D app. TG2 users should by now have all sorts of various technical solutions to create certain styles of terrain. For example, all that slashed look when you view the Wadi Rum from above is achievable in TG2.
As for the movie. I watched it again. I agree with a lot of the criticism of this movie but now I don't think it's quite as bad as a lot of people say. The main problem is the characters and what they do. It's not convincing and the only actor that did a really good job was Michael Fassbender. When the guy who was infected got torched by the blonde woman, for example, I couldn't have cared less because he wasn't believable or even particularly likeable in the first place. I then watched the first Alien movie and the characters were vastly superior.