I quite enjoy it... But I am 42 and I primarily bought the game for my kids to enjoy something that was a big part of my childhood. They are not old enough to understand the deeper complexities of tuning setups etc. Even for me, the game is very very hard.
I made a car that I tuned for 550PP for a Clubman plus High speed ring race. I got smoked, every single car in the lineup was faster. Spent a little more time and optimized and tuned. Even with pretty decent driving the best I could do was 4th (in 6-7 tries).
So I decided to get some help with the tuning and made a group 4 Supra GR race care according to Praiano's 630PP setup. Entered a race on High Speed Ring again. I suspect the car could even be further optimized for a high speed course like this, but it was really nice. But it was not easy! I thought that on Easy difficulty setting the other cars would be slower. No such thing. Even with what I would consider decent driving I am not able to keep up. There is another Supra in the race and he accellerates away from me on the straights and I need to do really nice weight transfer and find a smooth line through turns to take some of that back. Usually make my way up to a 4th-6th position and then someone bumps into me from behind and I spin out.
I don't know the course well enough yet to really maximize. For myself, this difficulty is perfect and I would enjoy playing like this. For my 11 / 13 yr olds though, they don't stand a chance. And it seems weird that even with a fully optimized/tuned car, we are still not able to advance on other cars on the straight on Easy difficulty where the opposition is supposed to be slower. Is this just me? Is there something else that could be wrong?