I am too a 3d artist and i hope stage 3 will come with a track editor or something to import them. RFactor is not as excellent as lfs physsics and car handling. I dont care if there is no new cars in lfs because what it is is very good, but tracks is not the same in my honest opinion. I think that realistic circuit means realistic driving, i explain.
1. Circuits are made by designers who are proffesionals and they know everything to make drivers "happy", so on people can make an exact replica of that circuit (with google earth elevations and 3d max for example, with bobs track builder or something new).
2.It´s known that talent drivers like Fernando Alonso practiced with racing games or simulators and they learned the layout from this experience. Hamilton for example or F1 drivers have their game simulators at their work place. This is an "open door" for the next generation of "poor" drivers.
3. Everyone knows racing one lap on a circuit and tell if this track can be pointed with 5 stars or 1 star meaning that that track is completely unrealistic or bad for some reason.
4.It is always better to have more tracks than less in my opinion, and if people can make them there will not be licencing issues with the naming of the tracks, just download and bingo.
Wel thats my opinion, i hope s3 will come with track editor or something because if that happens i will start building exact replica circuits, maybe Monaco, Hungaroring, Jerez, Estoril, Laguna Seca...