Argh! I just got back from playing a buddy online (I was the Steelers, he was the Eagles) and Westbrook is unstoppable. He isn't very good at Madden so he either runs it up the gut, or does a long bomb.
When I knew he was running up the gut I would do a pinch out of the 3-4 and also bunch my linemen up in the middle. I would then take Casey Hampton and proceed to get trucked over and dragged for 5 yards by Westbrook!
On the long bomb plays I would highlight who I though was his hot receiver (which I was usually right) and he would throw into triple coverage and still come up with the ball 90% of the time.