I have to agree that something isn't right with the Nismo. For such a heavy car, with 4WD, it seems far too tail happy and slidey. Maybe I need more practice, but it feels off.
The only car I was actually disappointed with was the Lambo. Well, the sounds at least. I preferred the mod sounds, but it's a small complaint.
As for the AI, it has a ton of work, especially in the Nismo. Try Imola, all Nismo's, you at the back, and I guarantee you'll run into multiple problems...
Cars stopping for no reason.
Swerving wildly and cutting across you.
Full force side swipes or rear end smashes
Cars breaking mid corner.
Ai that STILL does not lose control or spin
but, the biggest issue with it all?
The fact that they have removed track rotation from private booking servers, and have told the community that THEY need to develop that.
That said, FFB is definitely improved along with some of the sounds (try the Tatus for example). I also like the change to FFB damping. Previously, I ran this at 0% in Thrustmaster profiler as recommended in almost every guide. Now damping only applies when stationary, and adds a really nice weight to the wheel, making it feel like your tyres are actually connected. I recommend trying damping to see what you think. As it doesn't effect FFB whilst moving, you lose no detail, but do gain some slow speed grip feel.