Drifting and oversteer feeling in most sims is horrible, Live for Speed is still king, FFB is just so much faster, more accurate and doesn't give you fake effects like many other games do, like the feeling of understeer which is so bad in the drifting mods for Assetto Corsa or Rfactor.
I hope Dirt Rally step up and make the FFB on the level needed for a good rally sim but we are yet to see if that will happen, just have to wait in see and with it only being in early access a lot could change.