Yeah, Grand Prix Legends was pretty cool, I had that back in the PC gaming days.
In PCars 2 you find a lot of vintage stuff as well. Do you have all the expansion packs? There are some race tracks that dont exist anymore, and others that were heavily changed over time. Like the original Hockenheim Ring. But there are a lot of tracks that are pretty cool. Sometimes I even just cruise on the California coastal highway, or the Cote Azure road, in the `67 Mustang, or the Super 7.
The open wheelers are not so much my thing in Pcars, at least not the Formula. Though it depends on the track. In Monaco it can be fun, or a old Indycar on a oval track.
Thats just the thing, there are so many different combinations possible. Btw, Bathurst is among the real difficult tracks. May be just behind the Nürburgring Nordschleife. This part where its steep and windy downhill is a true killer. One little mistake and you are in the wall.
But usually a track "grows on you" after you drive it for a while. There are tracks that I like and have used a lot, while I almost never use some other. Sometimes this goes back to the old TOCA2 days even. Like Brands Hatch, its not much really, but its fun if you know it well. Or the short Watkins Glen track, that surprises by how fast you can get there if you know a few tricks. That scenic Scottish road is good fun as well, and there is a easter egg in it.
And some of the cars are amazing, too. Have you tried the Toyota Hybrid LMP yet? That goes as if its arse is on fire! Or this 50s Aston Martin, which is great to drive in LeMans - until you go over 240 kph, then it tries to kill you.
Another special field in PCars are the setups. Setups for each and everything, and another setup for the setup.... Its a entire science to master that, and some people have written entire books about it. I always found it to be a bit dry, I rather drive a bit instead. But if you want to take part in competitions, its very important to master this as well.