Oregon's record doesn't look all that different from Wisconsin's. It lost to a good Auburn team in a close game, had a stupid loss to Arizona State (see, e.g., Illinois), a close win against a significant conference rival at Washington (a good, but not great team; see, e.g., Iowa, but not as good), and put the hurt on a good Utah team (see, e.g., Michigan and Minnesota). Oregon didn't struggle much this season, but also didn't play as tough a schedule as Wisconsin.
Should be a really good game. And I really, really, really want to avenge the 2012 loss.