I think MSU should've been a 2 as well, but what probably did them in was how horrible the Big 10 was this season overall. 13 of their 16 conference wins were against Rutgers(x2), Illinois(x2), Wisconsin(x2), Maryland(x2), Indiana(x2), Iowa, Minnesota, NW. The bottom half of the league and some really, really bad teams.
Now look at where Michigan State is on this list.