Sure they are great defensively but they are 29th worst in the league in Shots against/game.
So they are poor in offense and give up tons of shots. They are depending totally on goaltending and have gotten 4 "extra" points for shootout wins plus they have played more games.
You have to look beyond the headlines especially in a league that gives points for losing as well as extra points for a skills competition if the game is tied.
As far as Danny Heatley, he has 22 points in 33 games. That's not exactly great.
Minnesota has historically been good defensively and most of that has been with great goaltending tandems. This year they have a few more offensive weapons available and it shows with their record.
Both of those things combined with consistent play at home and on the road will lead to points. The main test will come after the AS game and trade deadline during the final stretch to the playoffs when everyone has settled their lineups. If they can continue with their consistency then they can make the playoffs. After that, like every other team, it will be up to goaltending and depth in the lineup.
Uh. Sorry but No. They are near the bottom of the league in scoring.