In the summer I'll do a three way comparison of LFS, nKP and a real F3 car on slicks... And if I can manage it I'll get onboard footage to try and assist with that.
The lack of physical feedback, other than the poor technology of FFB (come on hardware manufacturers, surely you can do better) really is the biggest 'problem' of any simulation, and it must be tempted for any game designer to bump up the grip values a bit to make it more playable - a good example of that is the rF's F1 cars. Sure I'm not fast in them, but I've barely practiced. Yet you can do silly things with the cars at any speed but it just refuses, almost, to spin. LFS on the other hand takes a more realistic approach by saying 'okay, so you can't feel the forces, but I'm not going to nanny you around with extra grip or anything'. As soon as Scawen fixes the tyre issues (or rather improves as I doubt what we get in the next patch will be perfect, but then nothing is) to do with low speed and grip recovery then we'll see the cars behaving more realistically. Getting rid of the high nose bug will also make the cars a bit easier to drive I think, as the high front low rear setup makes the cars very difficult to drive consistently fast on the limit. With a less compromised setup i.e. sensible suspension values all round, it'll be a lot closer for everyone. The quick guys will still be quick and the slow guys will still be slow, but the margin between the two should close I think.
There are so many areas LFS can be improved. None of them are huge improvements, but just little tweaks here and there, thats all. nKP is unknown at the moment, but it's been in [private] development for about the same time as LFS. The difference of course is that Kunos has gone for the single seater approach to begin with, and has a more pure 'unmolested' development period, whilst LFS has had a more public evolution with road cars (until S2). I think it's fascinating seeing the two approaches, and I wonder how much of nK Scavier will look at, and how much of LFS Stefano has checked out... I bet they say very little, but in truth I bet they'll have a play or two to see what they like about it.