Now I know what you're thinking and it's not the RS3 referred to here instead it's a great quote from 2 time Le Mans winning and Audi peddler Allan McNish:

"It was typical Singer – understeered quite a lot, very consistent balance and it had the certain characteristics of a car that would be easy to drive over 24 hours."

The full article is here in evo:

Allan McNish: 2013 Le Mans interview part 2 | evo

Oversteer might be more exciting for the right moment but for consistency (and winning) understeer has it's advantages. I wonder where Audi RS get their inspiration from