I think if you haven't tried a Porsche or a Ruf on a track then you should be quiet.
If Kunos can nail (within reason) the feeling of a Porsche dancing on top of the track like they did with the Ferrari, then I fully support a Ruf.
But I voted Mazda, because I want my RX8 in the game. Plus 787b, IMSA GT cars (RX7, RX3), Grand Am RX8, the Legendary RX7 tuner cars, RX7 club racers, the original Cosmo... basically anything with a rotary would be sick.
Yes I have a problem. Let me Wankel in peace.