Though I don't have much experience with it game wise I kind of felt the clutch in GT5 was a bit "digital" compared to the PC games I've tried it on and that some effects, while there, aren't necessarily presented well in GT5. Like for example I'm sure you can actually stall the car in GT5 especially at low speeds but it's not easy to notice. Other games seem to do a better job of presenting the "bite" mechanic of a clutch compared to GT5, that's sort of what I mean by it feels a bit "digital" so it seems like there's not the same progression / modulation between clutch and throttle so the clutch is either ON or OFF in GT5.