Your life must be pretty boring (and sad) if you hate things like cars.
I appreciate every single car in the game the way it should be appreciated. There are many cars that should not be raced, the Prius (stock) is one of them, as well as many other models.
But to MY surprise, a lot of cars that I took for a spin in a free run, like the Fiat 500, the Prius, Copen Active Top, DLC Beetle just to name a few, were some of the best run I've had.
Maybe it's because I'm "old" compared to the average fan base of PS3/GT5 mix (I'm 33), but I tend to appreciate the smaller, less talked about cars rather than those overpowered beasts.
To be honest, I bought the last DLC because of the Beetle. I think I drove the Aventador in the speed test, that's it. As for the Beetle, I have over 200 km on it if I'm not mistaken, and it's great.