Nothing specific. Just saying in general, that the point I'm taking away is that even though a song may not be as popular, if it comes from Iowa, it makes much more sense. That logic just doesn't make sense to me. In your specific example, I have no data to back it up, but I would guess that you could take your pick of any Slipknot song and more people would know Thunderstruck vs. the Slipknot song. Just based off the demographic that usually attends college football games.
I am totally indifferent if it is actually Thunderstruck. The entrance song is totally for the fans and getting the energy of the stadium up before the game. Smoke on the water was a snoozer. So in that regard, Thunderstruck is an upgrade. Might not be the most up-to-date choice, but it could be a lot worse too.