A buddy of mine who bought the game actually figured out how to score, and said that he was score at a clip of about six goals a game. I recall that he said you actually have to work a little to set up scoring plays. You can't just ride in there like a one-man army, or consistently go to the corner trying to set up one-timers with a guy in front of the goal.
I think the key is to move the puck around the perimeter quickly. Get a guy down low, then pass it up to one defenseman by the blue line, have him pass it across to the other defenseman, and then pass it quickly to a guy cutting in front of the net. In other words, you have to keep the defense on its heels with rapid puck movement (just like real hockey).
Let your team set up in the offensive zone, and then pass it around - A LOT. I'm going to try this to see if I get any different results.