It seems to be a popular arguement that UND has some great defencemen because they have allowed the least goals. Think about it, UND has the most talented forwards in the league. They control the puck better than most and have some intense backchecking forwards (Parise is great at this). The other team can't score or get good chances without the puck. So when you look at one stat (goals against) - it is shortsighted to automaticllyattribute that to the defencemen and goalies.
As for the arguement that Greene is intimidating, I think any team should be glad he is on the ice as it is only a matter of time before he takes a foolish penalty. This is D1 hockey, a good player isn't intimidated by someone because they might get hit!