Mine was in great shape. Flawless interior and normal exterior.
Depends on the rental place and where it was rented. Always exceptions to the rule but most rental vehicles see a hard life. Some vehicles/drive trains are more susceptible to failure if not maintained correctly. Others can be maintained poorly but still live a long life. It all depends on how the well built and sensitive the drive train is to abuse and poor maintenance. I'm not sure on how the SkyActiv drive train is to poor service life and heavy abuse?
When people rent vehicles, they eat and drink inside the car. Kids spill food and drinks, dogs are put inside. Some are still smoked in but that's slowly phasing away.
I have yet to see a new rental vehicle that doesn't have dents and scratches. Plus most are washed using poor washing methods so there are swirl marks and clear coat scratches galore by 20,000 miles.
Yes, one can find a nice used rental vehicle but that's rare. Depends on location, where it was rented and driven to, how many miles, and how strong the drive train is to neglect and abuse. The amount of $ you save on buying a used rental can be better spent on just finding a used vehicle through private party sale.