My sports cars were not drag/track type, 240Z's (two of them), Alfa Spider, and Subaru WRX.
I would only classify the WRX as a perf car. The others were good sports cars, but, nothing to brag about.
Also, have only done the test drive on the Mini S. We had to order one (Clubman, S, auto) so won't be able to tell more until we get it.
First, RWD vs FWD. A world of difference. I think better, especially in low traction situations. It is really much better in any snow or slick roads. Better still was AWD of the WRX, but, that's another story. FWD just takes a bit of getting used to on a track. Is it better on pavement? Depends more on the driver than who has FWD vs RWD.
I would classify the Mini as a good sport sedan, not a high perf car. It is light, it has good acceleration at the low speed end, and has a decent suspension. But, not a high perf car. As above, autocross is a good place for it, modified it to suit your taste
If looking for a good small high perf sport sedan why not include the WRX or EVO? I loved having a sedan that didn't stand out yet could outrun many more expensive or more blatant cars.
charlie