So Polygon authored this article just to try do a run around and say they were actually right along even after their MK 8 sales prediction was proven wrong by reality.
Ok a little math for Polygon:
Mario Kart 8: 1.2 million units on a 1 system with 6.1 million users= about a 20 percent attach rate
Watch Dogs: 4 million units on 4 systems with 175.2 million users+ PC= a very low attach rate
Which is more impressive Polygon?