Something I did last week and posted on a Packer board. The data I used was from NFL.com. Vikings were and even 50%-50%.  
After 5 weeks I did a little number crunching.  Since people keep telling me it’s a passing league I decided to put that to the test.  I took the number of passing plays and rushing plays and found the percentages for each team.   Below are the top 6 in passing attempts and top 6 in rushing attempts.  This is based strictly on number of plays. NOT yardage.  The cutoff was 57% (the NFL average is 56.7%) and higher for passing plays. That broke the teams into sections of 14 and 18.  In week 4 it was an equal 16-16.  
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                      W  L   % passing plays
New Orleans Saints     1 4		71
Oakland Raiders        1 3		70
Cleveland Browns       0 5		68
Dallas Cowboys         2 2		67
Tennessee Titans       1 4		67
Detroit Lions          1 3		65
Miami Dolphins         2 3		50
New England Patriots   3 2		49
Washington Redskins    2 3		48
San Francisco 49ers    4 1		46
Houston Texans         5 0		45
Seattle Seahawks       3 2		42
As you can see the top 6 passing teams have a combined record of 6-21, while the top 6 running teams have a combined record of 19-11.  Does that mean that teams that pass more often, win less? Not really.  Of the top 7 winning teams three have a higher percentage (than NFL average 56.7%) of passing plays than running plays.
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                      W  L   % passing plays
Atlanta Falcons        5 0		62
Houston Texans         5 0		45
Baltimore Ravens       4 1		61
Arizona Cardinals      4 1		61
Chicago Bears          4 1		51
Minnesota Vikings      4 1		50
San Francisco 49ers    4 1		46
One other thing that I noticed is that the 14 teams with the higher passing percentage, overall their combined record is 30-35 for .462 winning percentage, while the teams with more running plays had a combined record of 47-42 for a .528 winning percentage. So is it still a passing league?  Passing is important but so far this year it looks like a more balanced offense is winning. I will attempt to look at if these numbers are off because teams get behind in games and are trying to pass to catch up. Because I know that is an issue, just not how big of one.