the driving is amazing. I'm a driving sim fan, I'm not too bad at Gran Turismo indeed... GTA is not a driving sim, but it does simulate the feel of driving. Do you know dem feels? It has a sense of momentum and speed. I used to play Midnight club 3 dub edition way back in the day, and to me it has a bit of that feel, but far more nuanced and dynamic.
I have also come to understand, the amount of traction had to be chosen to balance the vehicles for all terrain types. I'm the kind of person that will jump over a mountain rather than take the road around, even if it is slower and I end up on my roof. I have a blast barreling down the sides of hills and launching off jumps and fishtailing around like crazy. They have made the handling the way it is so that players like me can get up to stupid antics and still have some control over the vehicle. I'm not a noob, but I like to be reckless. The game allows you to be reckless without too much punishment. That is what made the driving of previous GTA games such a blast
to add to this, I was a pretty serious pilot on the combat simulator IL2 sturmovik. That game was fairly hardcore. Again, the flying in GTA5 is not like a simulator, but it captures the feel of flying. I just did a jet deathmatch and I'm slightly disappointed that my previous skills weren't useful and I lost badly if anything, the planes could be tweaked to fly faster and not make such tight turns. That is my only complaint regarding the vehicles