No, it is more than just that.
I understand that cars get tuned for understeer.
I also understand how to tune understeer out, and even after doing so, I can take a C5 Z06, or a 2005 Mustang and toss them into the first three turns of Tsukuba, and they will hold nice lines and drift until I give them some gas, and then the nose pushes wider the more gas you give.
Completely wrong, go out there and find me a FR car that converts instantly from oversteer to understeer when you get ON the throttle.
They drove "ok" in normal driving, but I didn't do much normal driving before I gave GT4 away.
Enthusia models the cars much better, and oh surprise surprise, the Vette is actually fun to drive, and can actually be a handful.
This isn't a thread about how much better EPR's physics are than GT4's though, so I'll just leave it at "GT4 has naff physics, and is NOT a real driving simulator".