Well, maybe James Franklin will finally beat Michigan this year....
Michigan is 15-2 at home under Harbaugh, with a 10-game home winning streak, and the crowd is louder for bigger games (eg. Wisconsin last year). We'll see what happens against OSU, though.... Meanwhile, it's not like Northwestern, Indiana, or Purdue* are tough environments, much less Rutgers and Maryland.
*I'll be there on Saturday, and while I expect there to be a much bigger buzz than when I was there in 2012, I bought my ticket yesterday, and there were still quite a few on sale, and I know there will be a decent contingent of Michigan fans, so I just don't see it being that different....