I completed Modern Warfare 2 in 4 Hours 44 Minutes and 23 seconds – Is that a record?

After Lazygamer posted up their review of Modern Warfare 2 this little article popped up stating

"Thankfully I didn't need to check the clocks as the game stores the time for you and accordingly I was informed that I completed the game in 4:44:23 which is not very long for a full priced game."

Is it really fair to charge full price for a game that clocks in at under 5 hours?