Yeap, seen it a couple times. Watch the WRC coverage on the Speed channel and you'll see a WRX commercial about every other one.
As for the ad itself, it's not bad. I wish they would show the car in different weather conditions. They always show it on a dry curvy road. Come on, show off the AWD a little. Also, I wish they would throw in a couple clips from the WRC rallies. Make people a little more aware of the connection.