All of my play-testing averaged out to a lot of scoring, but that was 2-player.  I was scared to death that would be the issue.
Most customers buy great teams from the past with strong run defenses.  
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But I feel good about the running game, as in reality there are often short gains and the rare long gainer (WN situation).  
I'm looking into changing the WN card/situation to be 50% long plays, 25% nothing, 25% fumbles, though.  I need to mess with it more.