Zardoz
This is news to me. Could you elaborate a little?
In GT3 if you took a car such as a Honda S2000 and tried to do donuts, full lock and then with full throttle step off the brakes, the lock seemed to reduce making a clean series of donuts almost impossiable.
When watched in replay you could see that before you release the brakes the front wheels would be at full lock, but as the power is applied the steering lock would reduce, despite the fact that you have appied full lock throughout.
Now I have not actually tested this in GT4, as I said it 'seems' to still be in place.
I have no idea if this is actually, technically refered to as a steering assits, that just how I describe it.
Gabkicks
the cars arent even that realistic at high speeds. Steering is too responsive at higher speeds for most cars. Its not about doing donuts, my beef is with cornering at lower speeds and cars having funky traction. Rear wheel drive cars are supposed to feel much more tail happy than they do in GT4.
Sorry but I can agree with regard to the high speed realism, steering is very responsive at high speeds.
I've never had an issue with regards to lower speed cornering, get the entry speed right, constant throttle through the coner and smooth throttle application after the apex.
Traction is in my opinion an issue with regard to the un-realistic grip levels offered by the tyres, which are set to high in my opinion.
I quite agree that the higher power rear wheel drive cars are a little reluctant to step out when you apply the throttle hard on exit, some of this I would again attribute to the tyres grip level. Some people however (and I do not believe you are one) think that all RWD cars should step out of line, and this simply is not true. Try and get a real world BMW 1-series to power oversteer, nearly impossiable even with the most brutal of throttle applications (unless the road is very wet), I should know this one, I've tried.
However, with all the above I still maintain that for the platform and the market demands of a volume game, GT4 offers an excellent level of simulation. Its not perfect, yet; but each game in the series has stepped in the right direction.
I have never claimed otherwise and would never say that GT4 was a true driving sim in every regard, but it is accurate enough to use for training, and as a game its damn good.