Corsi is emphasized too much. While it does give you an indication of possession and shot/scoring chances, it doesn't tell you at all "why" certain teams have balance issues. And while I agree that a poor Corsi rating is often an indication underlying deficiencies on a team, I believe there are instances where it is not the case (even if they are the exception).
The other thing is that is puts too much value on simple shots. Quite often if one team is playing a strong team, they try to pepper the net with shots just to try and get pucks on net and garbage goals. And the reverse is true... if they are playing a poor team that allows the opposition to set up and get better quality chances, why would they bother shooting from anywhere?
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"A pessimist thinks things can't get any worse. An optimist knows they can."
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