Yes, I thought the same thing when I tried the demo. I couldn't believe nobody was talking about how easily the car slides and loses traction at low speed. Felt unrealistic. The training had the same feel to it. Lost grip very quickly. Then I kept reading the reviews and had to try the full version.
Whoa! The S2 version is a masterpiece. I've never gone back to rFactor since. Everything feels right, physics, tires, setup changes, etc. I'm fortunate enough to run LFS at 1920x1080 (32 bit) w/maxed out details on a Westinghouse 37" widescreen monitor and it is stunning. Together with 5.1 surround sound, Momo wheel, ECCI pedals, this sim really pulls you in. Driving the BMW F1 car at speed makes a grown man giggle.
The AI can be very aggressive at PRO level, but I'm sure this will be tweaked in upcoming patches.
NetKar Pro looked terrific also but the cars seem underpowered compared to the cars in LFS & rFactor. I'll probably give it a go anyway. The reviews have been very positive (love those cockpits).