They are more of a drag / sprint than a pure track I think, I'm yet to drive one but I've read various comparisons and the conclusion is mx5's will take anything you throw at them whereas the mr2 can bite back.
I've driven a few rwd cars and they all feel so much nicer to drive than many of the fwd cars I've had so decided my next car must be rwd, as I only turn 21 in january insurance prices limit car choice pretty much down to a e36/346 325 out of which I only really like the compact, the mr2 and an mx5. Looks wise the mr2 wins hands down in my eyes and after reading more and more into the car I fell in love