My idea on how to further the rovers is simple.
The graphics are gorgeous, the design is flawless but the handling and terrain navigation is not what I would expect to see out of such an enormous vehicle, even for the little guy.
My "solution" or "improvement" that I would like to see is to make the rovers, especially the large rover, move slower. In addition the controls (forwards, reverse, turn) would be fixed to the vehicle cardinal direction and not the cameras. The same issue I found with Call of Duty WWII campaign, when you assume control of the tank. It does not handle as expected, rather you have to perform witchcraft to maneuver the vehicle to go in the direction you desire.
The next one would be with the grip of the vehicles. With the vehicles weight and the fancy sand tires, I fully expected to be able to pull the vehicle along the alien surface with ease and to be able to climb hills easily. It is not so easy. You also don't drive the vehicle. It feels like your'e ice-skating around the map with no sense of control or direction.
TL;DR - Make the rovers feel heavier, give them better grip/stability, and make it feel more like a vehicle than ice skating.