I was being sarcastic about noobs on sticky tires. However I still believe there is a lot to learn from starting out in autocross in a slow car, with soft suspension, and crappy tires. When you don't have a lot to work with, you can concentrate on technique. Plus soft suspension makes the whole weight transfer thing brutally obvious.
That said, an STI on crappy tires probably isn't going to teach you much about anything except for wheelspin.
The RE070's are a terrific tire for autocrossing an STI, regargless of driver skill level... they're just what the car likes to run on.