Yes, as far as driving physics goes, GT5 is much more realistic and better than GT3 but that wasn't the point that I was trying to make. Plus it's not just the realism which creates an impression of what a racing game is like. If every single racing game was purely focused on realism, then they would all seem very similar in style and would become boring.
Yes, wheels will make you faster but this isn't always the case. You will always have people using controllers that could give wheel users a run for their money. But even so, on straights a wheel or controller will make no difference on how fast you are. If you get near to an AI controlled car then you can literally hear them lifting off the throttle and I'm saying that this is ridiculous. No other AI in other games does that for sure
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