Against lower ranked teams than them. They've looked terrible all year, but good enough for a middle of the road pac team during a down year.
What did utah do that was so impressive? Beat Michigan in game 1? Look at the injuries they have going into this bowl game. Beat Cal by 6 with 7 turnovers? Beat Colorado by 6 with 4 turnovers? What impresses you about Utah so much that they'd certainly be favored?