GLENDALE, Ariz. — Another trip to the desert, another Fiesta Bowl disappointment for the Oklahoma Sooners. West Virginia University, playing without its head coach but fully stocked with its playmakers, routed OU 48-28 Wednesday night in front of 70,016 fans at University of Phoenix Stadium. “They played an excellent football game, really beat us in the offense and defense side of the ball and in every part of the game,” OU coach Bob Stoops said. Done in by a stagnant offense in the first half and a gaping defense in the second, third-ranked OU suffered its fourth straight Bowl Championship Series defeat. A year ago in the Fiesta Bowl, Boise State stunned the Sooners with a series of late trick plays and beat OU 43-42 in overtime. West Virginia needed no such trickery Wednesday night. With the quick feet of quarterback Pat White and backup tailback Noel Devine running wild, the Mountaineers bolted away from the Sooners in the third quarter. The 11th-ranked Mountaineers played under interim coach Bill Stewart, who took over two weeks ago when Rich Rodriguez resigned to take the Michigan job.