Would have preferred that the car was a different colour than silver, as the overall effect here is a very grey image. The selective desat was a great idea, and if the car was Red or something similar, this would have worked really well. The lack of that splash of colour is what is hurting this...
I don't really get where you're going with this. I'm not sure how or why I would think the car was built on Mars. As for the shot, it's fairly ordinary, the desaturation hasn't really done much for it other than to make it look quite flat and dull. Giving this a 3.