Try driving real-life car with a 360-controller and then tell me how good is Forza.
LFS is at least a _true_ simulator, nothing is faked, everything is simulated down to tire dynamics, wear and sounds (even though some find them crappy, but at least they aren't sampled).
And yeah, I've driven real cars, I've been playing LFS for few years, and I've had Forza for 1.5 years (first part of course). So you're not the only one with opinion. And from my point of view Forza is oversimplified. Not like NFS, but to a degree that it's instantly playable with controller by any 9-year old. Steering is nothing compared to LFS. I know I don't have a proper feedback with controller like I would have with the wheel, but it's still arcadish. You can turn from lock to lock in almost every situation and recover from it.
It's not terrible by any means, in fact it's a very good game, but in physics simulation sense and in effect from tuning/setting up the car it still quite far behind.
P.S. It's not like I'm trying to convince you, I know that I (or anyone else) will NEVER be able to convince you, so continue playing forza and be happy. But I can't leave LFS undefended on public forum