@ Birder - I've probably been to a track day you have, I've done loads of Javelin and BaT days in various cars.
I tried rFactor over the weekend due to this very thread (I recently got a G25 and was interested in the thread). Risking turning this into an rFactor hijack, I initially thought it was pretty good because it has some tracks I've driven on. I like the sounds (brake squeal etc) and (ebmarassingly?) the dirty windscreen. It was a fun few hours but it just doesn't feel like LFS does.