I’m getting pretty tired of being limited in my car selection in having a chance to win 1st over the SRT Viper '08, the X-Bow, the '82 Ferrari race car, or another super grip car on these S class lobbies. If they’re going to have that much grip and dominate these races, they should be at least PI 825.
Another issue is the over abundance of tight corner track choices in the lobbies. At least in Forza 5, we got a variety of every type of track. Now, all we get is these tight corner tracks with almost NOTHING to execute engine power on except for Road America every once in a while.
I enjoy the challenge of trying to beat those cars in technically inferior cars. You can take out these cars, but then others will simply take their place. There will always be certain cars that handle better than others. You have two choices: give in and use those cars yourself or try and beat them with better race-craft and track knowledge.
As far as the track selection, I feel like there is a decent mix of handling and speed tracks, although some more variety would always be welcome. You mentioned Road America, but Bathurst, Sebring, Daytona infield, Le Mans, Spa, Indianapolis, and even Watkins Glen have some decently long straights to put your power to use.