Agreed. I just made this - it is not a complete analysis. And it's far from mean as a "RBR and DiRT Rally is superior in every way - D4 sucks". However, it shows how the Subaru Impreza 01 breaks traction in RBR, DiRT Rally, D4 and then some clips from real life, one with the 01 Impreza, one with an early Impreza WRC and one with the 95 model. Then the 01 Impreza real life powersliding, attempts to do that in D4 before ending off doing both exercises in D4, but with the Ibiza SuperCar RX - which actually works more like you would expect from 4WD cars.
There is also some setup fiddling with the 01 Impreza in D4 to try to force it to break traction easier, and more rear power. The rest, RBR, DR and Ibiza are default setup.