I don't know anything about Auburn and Washington other than their schedules, but I know that Wisconsin's defense started the season somewhat depleted by injuries, and has accumulated significantly more injured players in key positions over the course of the season.
Were the Badgers overrated to start the year, barring those injuries? Probably a little. When factoring the rash of injuries in? Way overrated.
I won't lose any sleep over that, but there will be hand wringing in the future the next time people start to suggest that the Badgers should start the season in the top 10.