Agree. I'm of the opinion that real-life sports would be very boring if every single game played to its respective league average. You have some high scoring games, some defensive, low-scoring games, and some that fall in-between. That's what an average represents - not the fact that every game should play out with similar stats. Reality doesn't do that, and neither should the game.
And the only way you'll know what the "norm" is for a slider set you're using is to PLAY THE GAME. A lot.