Madonna was the exception to that. As the only act with more viewers during the half time show than the game.
Quote:
A record 111.5 million people watched the Fox network telecast of the Super Bowl on Sunday, keeping the NFL championship game ensconced as TV's perennial U.S. ratings champ despite the most lopsided game in 21 years.
(...) The halftime show, which featured singer Bruno Mars and the Red Hot Chili Peppers, was viewed by an even larger 115.3 million viewers, passing the record 114 million who watched Madonna perform two years ago.
So you see, it is with these official sources that I am 100 percent confident in saying Madonna is the exception to the rule. Her show got more attention than the actual game.
Though, if you have an issue with that and you would like to take it up with billboard: I won't try and stop you.