After the Minnesota Vikings' 34-10 victory against the Arizona Cardinals, here are three issues that merit further examination:

Following their win against the Arizona Cardinals, the Vikings take a seat in the examination room. Kevin Seifert

I honestly don't get what people expected from quarterback Donovan McNabb this season. He is generally a well-respected NFL citizen. So when the Vikings acquired him this summer from the Washington Redskins, no football person was going to come out and say how far his career had plummeted. But the evidence was all there for the taking. The Washington Redskins were willing to give him away for a sixth-round draft pick and take their chances with Rex Grossman and John Beck. The Vikings were able to leverage McNabb into a contract worth $5.05 million, one that befits a top backup. And that's the way he has played so far this season: Like a veteran seat-warmer. McNabb has been inaccurate on short and deep passes and has mustered one victory in five games. None of this should be a big surprise, nor should coach Leslie Frazier's decision to retain him as his starter. Frazier wanted a veteran to start ahead of a rookie he didn't think would be ready to play. The NFL doesn't have enough good quarterbacks for a team to find a high-functioning one who can fit that description. Frazier got a seat-warmer who is playing like one.

Let's give defensive end Brian Robison some credit. A few of us wondered if the Vikings had made the right decision by allowing starter Ray Edwards to depart via free agency and inserting Robison into the starting lineup. Robison had been a backup for four seasons, and usually you are what you are by that point. But Robison's two-sack day Sunday brought his season total to 4.5, tying his career high. (It's also three more sacks than Edwards has for the Atlanta Falcons, but that's an apples-to-oranges comparison.) The Cardinals couldn't single-block Robison on Sunday, and his forced fumble on quarterback Kevin Kolb in the first quarter was one of the key plays in springing the Vikings to a 28-0 lead.