MR cars are generally considered to be the best balanced vehicles. You'll notice that the vast majority of the world's "supercars" are MR cars... They drive differently than you may be accustom to, but once you get used to them you'll love them.
As far as MR cars go, I don't personally like the Saleen much.
As for the Saleen, She is Pretty sweet, if your into American Super cars. Her acceleration is pretty good (You dont realize how fast your going, one look away from the speedo and BIG leaps in speed) Because she gets such high speed so quick you have to mind your breaking distances to insure you got enough track to slow down, but all in all she pretty good.
The Saleen is pretty old school, dynamics are looser than the NSXR and most other modern MRs. Brakes also merely average. Good points include great torque, modest wheelspin and the aforementioned understeer, which makes it easy to trim the line.
Not a bad car, but there are much better MRs out there.