Really the title is all you really need to know if you're a true simfan.
This game is really great, but the absence of third party steering wheel support instantly make this game a failure to any real simfan. After playing prologue with a g25 for months, going back to the lousy microsoft wheel with it's shoddy force feedback kills all the fun for me, and make the microsoft wheel combined with any game feel like a cheap toy.
It's like driving a Lamborghini Countach, It looks and sounds awesome, but it drives like crap. Lack of third party support for wheels is really the only flaw this game has, but after playing pc-sims and prologue with a G25, I fail to see how this is remotely interesting to any serious simracer. Still, this game can't score a 5 for a true racefan, due to this. Every racing sim centered site will tell you this.
This game can only be worthwhile if you play racers casually with a controller instead of a wheel. In other words, this game is for people who like simracing without realism.