I drive a rental as if it were my own car... a new car I purchased. I dont abuse it in any way. I even dodge potholes and rough pavement. Maybe thats weird, I dont know.
Reading this makes me be sure to never purchase a rental car for myself.
My aunt did last year... a 2009 VW Jetta... seems to be fine though, never had any problems. It had 23K miles, probably around 35K now.
One car I recently rented, a 2011 Ford Fusion, there had already been bumper scratches and some damage and it only had 6000 miles... rental place knew of this, said they had not had time to fix it. No matter, as long as it got me to where I wanted to go.