One of the writers from EGM had some pointed words regarding GT5s physics.
"I have always felt that Gran Turismo cars oversteer and dont weigh enough, leaving them feeling stiff and unrealistic. The obvious measuring stick is the physics engine in the Forza series, which is particularly gratifying in tight corners, where the weight is shifted over the wheel base. I know that many GT5 fans wont agree with me, and this game for them will probably feel right at home."
I actually agree with this. Although I love GT, the physics always felt a bit stiff and lifeless to me. When I play Forza, it feels like when I drive my own car. You can really FEEL the turns, they are such a joy to take.
I dont know what the issue is with Polyphony, when I play any GT game, they feel like a videogame that is unable to capture what it actually feels like to drive a car.