Arizona just beat Washington by 5 touchdowns. They've equaled their win total from all of last season. In 2011 their only wins against BCS level competition came against UCLA and Arizona State, two teams that finished with losing records and fired their coaches at season's end. They lost 48-29 to a Colorado team that finished 3-10. This year their only losses have come against undefeated Oregon, undefeated Oregon State (by 3 points), and at Stanford (in overtime).
Their head coach has already eclipsed his win total from his first season at Michigan (but yeah, it is always about the coach, especially when a freshman placekicker struggles). The guys from his first full recruiting class (the ones who were true sophomores when he got fired and everyone said were too small and sucky to even compete in the Big Ten) have now won 80% of their games as upperclassmen. A few not-terrible performances on offense could easily have put their record at 19-1 over the last year and a half.
Hooray for hiring two good coaches in a row!