I was confused too. But not for the reason Samus is saying, but because I dont understand some things and I completely disagree in others.
First I didn't see nobody saying something of GT sales on PC. Didnt understand the comparision between Mario Kart, TDU and GT for hot lapping either.
Then I think there is a difference between appearing to be special and being special. When I used to play GT5, cant remember very well but I really liked the presentation, minimalism and the polish appearance in general. But the gameplay didn't have much. The driving was good, the FFB was very good but the AI was, like we know, idiotic. The races were pretty dull and the only thing that keep me going was the possibility to get better cars.
It happens to me exactly the oppositte with other games. AC and SLRE for example have very bad appearance. But AC is the only game I know that I can play hot laps or single race with the AI and say wow. The same feeling I get when finishing a rally stage in SLRE.
I have the sensation that GT, because of the past golden age, get's the recognition and fame other games deserve more.
Other thing I didnt understand is saying that GT is more accesible than Driveclub. I think is the other way arround.
Not agree, at all, that PCars or Driveclub dont have good soundtracks. But I understand this is a thing of personal tastes.
And I dont believe GT is the gaming title that gets the best the automobile culture. Specialy GT Sport. I like how the present the cars and other things. But I like more the aproach of other titles like Driveclub (the carreer mode titles and the general aproach to the road cars), AC (speacial events names and how every car shines), PCars (racing world aproach)...