You could use the points system, and then average it out by the number years that team has been in the league.

For example.

Team A:
Year 1, not existent
Year 2, 3rd - rating of 10
Year 3, 8th - rating of 5
Year 4, 5th - rating of 8

average rating = (10 + 5 + 8) / 3 = 7.67

This might not work if one of the teams that have only been in for 1 or 2 seasons would be considered an anomaly.

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Ultimate Dynasty League
16 Team Dynasty League H2H: G, A, P, PPP, SHP, +/-, PIM, SOG, W, L, GAA, SvPct, SHO

C: Stamkos, Getzlaf, Carter
LW: Ovechkin, Kovalchuk, Brown
RW: Iginla, Pavelski, Horton
D: Byfuglien, J.Johnson, Goligoski, Hedman, Hamonic
U: Mueller
G: Schneider, Hiller,
B: E. Johnson, S.Kostitsyn, Neil, Biron, Giguere
IR:
Prospect: Nail Yakupov, Tangradi

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UHL Dynasty St. Louis Blues
...a bad team trying to rebuild...