Hockey is fairly unpredictable.
Here is the preseason poll:
(1) Denver - underperformed that ranking in regular season, made Frozen 4
(2) BC - #1 most of the year, missed Frozen 4
(3) Boston - underperformed that ranking in regular season, made Frozen 4
(4) Michigan State - great regular season, missed Frozen 4
(5) North Dakota - missed everything
(6) Minnesota - performed slightly above ranking most of year, missed Frozen 4
(7) Michigan - missed everything
(8) Quinnipiac - underperformed that ranking in regular season, missed Frozen 4
(9) Cornell - underperformed that ranking in regular season, missed Frozen 4
(10) Wisconsin - missed everything
(11) Colorado College - missed everything
(12) Maine - performed above the ranking
(13) Providence - performed slightly above ranking
(14) U-Mass - performed right at ranking
(15) Omaha - missed everything
(16) St. Cloud State - wildly underperformed, missed everything
(17) Western Michigan - wildly overperformed, national champions
(18) UMD - wildly underperformed, missed everything
(19) Notre Dame - missed everything
(20) Arizona State - slightly outperformed this
(unranked) Penn State - made Frozen 4
(unranked) Ohio State - made NCAA
(unranked) Minnesota State - made NCAA
(unranked) Connecticut - made NCAA