There are some very nice tracks from the otherside of the pond, some of which are right at home in a list of 20 or so tracks for the ultimate racing simulator, having said that just like in Europe the majority are average and especially the American rovals are really boring tracks.
Sim times should be seconds a lap different (usually faster) than real times because setup/testing is limited IRL where in the sim you've got ages to perfect them, one can also drive much harder in a sim knowing there are no risks and also important are physics elements that aren't simulated, chassis flex, track surface (including dirt and oil laid down onto it), properly variable winds and micro climates, very limited engine simulation that naturally tends to choose the most powerful figures anybody can produce for a car regardless of whether they're accurate, same story for every other element of the car the fastest result is nearly always chosen