Well thank your lucky stars, because it's not "as bad as it looks" (24.10). Mark is unharmed (albeit shaken up) and the rover's atmospheric barriers are still intact.
First things first: Mark needs to perform a closer inspection on his ride. Luckily, the only damage is the loss of a few solar cells—and he even brought along a spare. The harder part will be flipping the rover back over.
Thankfully, Mark brought along a lot of tools "for the MAV modifications" (24.55). He uses the rock drill to attach a cable from the rover to the surface, using the extra tension to flip the thing right over. Success. After righting his little trailer, he gets on his merry way.
After two more days of driving, Mark gets a blip on his radar from the Ares 4 Hab, a.k.a. the Promised Land. If there's ever been a time to blare "Eye of the Tiger" at full volume, this is it.
When Mark finally does reach the MAV, he "knelt on one knee and fist-pumped repeatedly" (24.146). At this point, friend-o, we wouldn't expect anything less.