Really though, I think part of the problem with forza in general in regards to realism is because how many real pictures are shot from that angle? That's always been a problem I've had with the game since 1. The angles in replays for example, do NOTHING to show off the game, and those stupid car rotations 3ft away from the hood never worked.
I do agree with other things mentioned here though, some of the cars do look a bit sterile. The models need proper shadows in places like around headlights, inside of rims and nooks and crannys on the body of the car.