The Scions are nice cars. They are "premium subcompacts" with excellent build quality, good rides (for their size), good use of interior space, quirky styling (take that as a good or bad), and good prices. Toyota has provided excellent aftermarket for them. Young people seem to like them. I was driving the first xA in my area a few months ago and teenagers noticed it.
There are many young adults, like Bigals, who want an American car with a V8 and rear-wheel drive, but they're not the majority. And (please, Bigals, don't take offense) they're not the progressive group who start trends. Scion vehicles are meant to be for modern young people who like to be on the cutting-edge...call them trendy. If you saw the swag Toyota gives out to the media (read "middle-aged men") to promote the Scion brand, you'd laugh. One-shoulder bookbags, Red Bull Energy Drinks, "house" music CDs, and (this year) clenched fist antenna toppers. Bigals, I can't imagine you being into these things. You're not the target audience for Scion (again, no offense).