You would think that the way road racers talk about the ovals they would win every race, yet we have not exactly seen road racers do too well on NASCAR ovals. However, we have seen many oval drivers do well on road courses. Ovals and Cup cars are not as easy as the road racers make them out to be. Plus, with 43 cars out on the track, you actually have a chance of being passed. Put 43 F1 cars out on a road coarse and then you will have a race! With the exception of the useless full course yellow flags, the best races of the year (from the television viewer's POV) are when NASCAR races on road courses. There is a lot more excitement there than in 20 F1 races.
Also keep in mind that with the exception of Daytona and Talladega, NASCAR drivers must break, apex, and accelerate out of each corner just as on a road course. Does it really matter that they only turn one way, since they are performing the same tasks otherwise? True, they do not have to deal with off-camber and hills, but it is still not too easy. If it were so easy, then any of us could earn millions per year being Ricky Bobby, right?