Sanchez, it really doesn't. I played a whole game with WR's / QB/ RB, as my o-line just to see if ratings ment anything. My team held its own and allowed only 1 sack?!?!?!? I also tried this with a lower rated linemen and they same held true. They played just as good as my high rated lineman. Now, this is playing out the game, not supersim.
This really bummed me out when seeing this.