Everyone has their own idea of a sports car. For me (being an old bloke) the most exciting sports car I ever had was the Austin Healey 3000. That car was fast in its day, it was also hard to keep on the road when driven hard, most of all it was fun, an instant pulse rate raiser. I have an M roadster now. For me this is the nearest I can get to the old Healey 3000. As with the Healey its fast, driven hard its not that easy to keep on the road and it raises the pulse rate. Most important as with the Healey, it has character.
If you want a fast car that does everything very well, including understeer! but with no personality get a Porsche.
I say a true sports car has a powerful 6 cylinder engine in the front and rear wheel drive. That's a Z. That's why I bought mine and it's why I love it!!