If we take the shots taken in the games so far and add up the expected shooting percentage based on their locations, we can come up with an estimate of how many goals each team should have scored.
Here's the chart for the first five games:
|Home||Shots||Goals||Exp Goals||Away||Shots||Goals||Exp Goals|
No surprises there - the teams that won got much better shots, and the three teams that tied despite having better control of the play should have won...but didn't.
Note that this is a very coarse metric because relatively few shots are taken in a game. I have much better data relating to field position that I'll discuss in the next couple of days.