Aspec is way too easy. The only way to make it fun is using a car 50 to 100 pp less than the ai, with tyres 1 grade worse. No aids. No abs is fun too with the right brake balance.
The ai is superslow at cornering. Easy to beat on most tracks. There are the odd races with one really fast ai, like that italian race with the enzo at monza. Or that jag xjr9 in that dream car championship. You might need a better pp car to be competitive there
It all depends on how the race goes. if you find yourself overtaking all the opponents in the first or second lap, its gonna be a boring race. Detune your car.