In 2002, Iowa was one half and/or one lucky pass play by OSU against Purdue from playing in the NC game that year.
In 2009, Iowa was one ill-conceived naked bootleg in the end zone from possibly going undefeated, and playing in a NC game that year.
In 2015, Iowa was one stop from making the playoffs that year.
National Championships? No, but let's not make Ferentz's tenure out to be a mess of mediocrity, either. It's fine to be miffed about the misses, I certainly am, but there's credit to be given, too.