I was lucky enough to get in early on the beta
rFactor 2 does a lot of things very well... Lighting transition looks fabulous, set it for 5am and watch the sun come up, it's beautiful. Sounds is great, the reverb from the stands is wonderful. AI is smart, they won't divebomb you like other games.
But.... the core driving experience just isn't as good as iRacing, it isn't as good as C.A.R.S. either which I'd put in 2nd place at the moment. Combine the accuracy of the track with the indefinable "feel" of the force feedback and rF2 is a bit behind as it stands.
I was really expecting more of a "WOW" factor and it just isn't there for me. The Megane's and the Formula Renault cars just remind me of everything I didn't like about rF1, they just feel disconnected from the track somehow.
The 60's Formula cars are a lot more fun and I'll definitely spend some more time with them.
Overall, it's pretty good but others have raised the bar quite a bit higher in the last few years and rF2 hasn't quite kept up.