Generally old cars on new tracks suck. Really bad.
Learnt that first from GPL when I saw Sepang for download, and though "great, a track I know - has some nice fast corners, should be fun". It was awful, because you know of it with downforce, and and it feels to boring to drive without downforce. It's just going through the motions, there's not challenge. Brake > steer > throttle. Same with any sim trying to replicate the golden days with new tracks. It just doesn't work.
GTR itself bored the pants off me within 2 weeks. I'm not even gonna bother a try-before-you-buy with this one.
As Go Alesi said, it needs some old versions of the tracks to work at all.