So you are saying that a 650hp, 900kg LMP1 car wouldn't suddenly swap ends on you when you overpowered the enourmous mechanical grip of it's slicks by being an unmitigated simpleton with the throttle? And that you have never seen an F1/Indy car/LMP1/LMP2/GT1 car lock up when the driver gets it wrong? People need to realise that winged competition cars don't work at slow speed. The majority of the grip in the most high end racing cars is produced through downforce having an effect on tire friction, something that Forza models very well. The lack of this in the road cars is what makes them fun, and very difficult if tuned, to drive. Give me a mildly modified Clio V6 and Road Atlanta and I'll be happy forever in FM3. My one gripe with FM3 is that the grip level is easily overcome, which isn't necessarily incorrect, but it makes certain elements of the game, such as drag racing very difficult in higher powered RWD cars. In the game, AWD will rule due to the physics engine unfairly biasing in their direction, whereas we know in the real world, in both drag and on road racing in favourable conditions, RWD is ultimately faster.
What you have to remember, from the safety of your arm chair at home, is that there are a very select few that are suitable to drive these cars at this speed in the real world, and even then they frequently get it wrong. The likelyhood is that if actually released on to a track in one of these vehicles and proceed to drive it in a manner similar to how most of us would drive it in Forza/GT etc. then we would be seriously injured very quickly. Having a go at Forza because it makes them difficult to drive is a tad shortsighted, no?