None of those cars you mentioned are hard to drive
Nor do they show realistic handling traits mid corner if you abruptly lift off the throttle...which makes the game and physics way too simplified. The weight transfer just doesn't seem to work all that realistically in that situation sorry to say.
Entering a corner is about as simple as hitting your braking point, trailing off the brake and turning in for the apex. The physics don't penalize you much with any oversteer at all for the way you enter the corner, in regards to your smoothness with the inputs (letting off the brake, feeding steering in slowly and carefully, etc) . Regardless of what you do the rear always seems to maintain unrealistic amounts of traction and stability...which is a huge flaw to anyone who knows vehicle physics.
The 993 GT2 is basically a death trap for all but the best drivers in real life. In the game you can basically punch the throttle mid corner and abruptly lift off without worrying one bit over having a moment...do this in real life and you would be stacked up in the tire wall from massive snap oversteer that you could only control with the throttle
The car does seem to show a bit of oversteer entering a corner when you do carry to much brake and steering input into the corner, but it doesn't penalize you nearly to the extreme in the way it would in real life.
The physics are really my only gripe of FM3...everything else about the game is wonderful with many aspects that I find much better than Prolouge
But the problem for me is that the physics are the most important part of a racing game...and FM3 is a let down in its simplicity