There's a couple of things I'm finding pretty frustrating at the moment, if I may. Although slightly off topic of handling to start with - the AI in multiplayer leagues, co-op career make it unenjoyable at the moment. They seem so much more aggressive online and their level feels 10% or more above their offline equivilant. This is me playing on 100AI offline. I can qualify P1 and then just go backwards as the race progresses with no grip or traction out of corners. The AI seem to be able to get more speed with less downforce and there is no discernable degredation for them. Their outlaps after stops are lightning quick and they still put in fastest laps on 20+ lap old tyres. On top of that, the AI are fixed to the track. If you clip them (and even if you try just to see for example), you cannot knock them off the track at all. You can be side by side, driving full lock into their rear tyre to make them spin but they won't. They're invincible. If they even touch you, you're dead.
Anyway for handling - I feel most things are bearable but the following points:
Camber/Toe settings need to have an effect because they don't seem to and you can run right right, left left all the time.
To get the most rotation, we all generally run 50/50 brake bias but IRL this is almost always up at 56/57.
Suspension - the cars don't ride kerbs. There are certain kerbs that if you even slightly touch, you're off. Suspension, ride height etc... Seems to have little effect. Already running 7-1/10-1 etc... To stop the oversteer.
The main one for me though, is the car letting go at high speed - example being T3 in Spain. The rear will just let go at high speed. Even with more than enough Downforce and modulating the throttle. If you're on the line or off, it is the medium/high speed letting go that's the worst. There's no indication of it. Even with oversteer enhance ON there's no warning it just goes. This is something you just wouldn't see I don't think. Each wing at that speed generating over 3500N of downforce at that speed, no matter how slippy the tyres, I just don't think they would slip that much. I really think it needs looking at.
Forgive a novice having his say, I think it's an awesome game but some little things make it crazy frustrating