First, I don't compare RigNRoll with PES.

I compare the minimum requirements of 2 games and see what the difference between the 2.
I don't mind that RigNRoll is Heavy or what so ever.

My PC meet the minimum on both games but
PES is playable
RigNRoll is unplayable (bugs & crashes)

When I hear all your arguments about it, We should consider informing the world of the new aspect of purchasing a game :

"If your PC only meet minimum requirements, don't expect the game to be supported nor the game to be working on your PC." These requirements are just displayed to fool customers and get more money from them.