I already mentioned the two ranked opponents in that list. None of the others are. It remains to be seen how tough they really are this year.
Miami (13), Iowa (10), Wisconsin (12) AND Penn State (14) were all ranked in the Coaches Poll, after after the next one, Michigan will probably be in the mid 30s. 4 top 15 teams is pretty impressive...certainly more so than Georgia Tech or Florida or something.
Public Universities face major political pressure to play a few revenue generating games with smaller, in-state schools. When Ohio State plays Ohio University, OU gets $500,000 towards their athletic department, and all that money stays in the state of Ohio. Everybody wins.