Wow...what would i like to see in GTR3....well, thats a big question.
The only answer i can think of is: I would rather have less classes and gimmicks and more natural car physics than loads of classes and bad car physics.
Putting together a top5 i would say:
1) AI...what can i say...dont make it good, make it the best!
2) Car physics, with a good damage system: tyre puctures (not like F1 2010
) ect
3) Good weather system with a rain radar (look at the dutch
www.buienradar.nl).
4) Safety car for accidents and very bad weather
5) Grapics, race classes and good exterior(!!) sounds for the replay!!
Something in that order but thats my personal view.