Well, everyone drives the FZR... I myself am about 1-2 secs a lap faster in the FZR than the other GTR's. But I really like the FZR.
In my opinion, the LFS GTR class is a bit strange: The devs tried to create 'GTR performance' cars out of the cars already available, although you would never see such a thing in real life (GTR's with a 4 cylinder engine, except for the Lotus cars).
It would have been better if they created something like a GT2 class (450 hp) running the FZR with only 450hp (a reasonable figure for a flat-6) and maybe a RA GTR with a V6 or V8 or V10 thrown in. Or with the LX8 GTR...
With the other cars they could have created a Touring Car class, running cars with approx. 300hp. They could have used the TBO class cars for this series (slightly tuned, and lighter, with slicks and maybe wings) and maybe a GTI with a stronger (6cyl?) engine, to have an NA competitor...
I personally wouldn't mind if they remove cars or modify them, I really don't consider the FXR and the XRR that realistic. For S2 final I wish that these cars would get at least a 6cyl engine (to create something like a JGTC car, they run mostly turbo'ed 6 cylinders and put out about 500hp), this would be much more like a GT car...