Combination of Style/Uniqueness/Performance.
I don't care if the car is fast, but if it is fun to drive that's all that matters.
Example, the 2000+ Celica, a GT-S model has adequate performance, a six speed transmission, and a really awesome interior. The exterior is quite nice on the car as well, with a trim level for everyone. Personally I like the new action package (not the old one) that comes with 2005 celicas. The interior is what sells me on the car, and one day I might buy one but for now I'm happy with my sc400.