To pile on, I've only seen Wisconsin once this season, but Miller was the perfect pick. We critique the Ranger's drafting, but they made sure they could select this well-regarded prospect with the upside to be an impact player.
However, offense is not an issue. [Gravesy check-out the guys at hockeyprospects.com to supplement Pronman.] Simply, the only big question was him becoming a legitimate defensemen, after playing forward for much of his childhood. That is the main reason not to rush him. Last year, he demonstrated he could. Now he is beginning to thrive under the staff in Wisconsin. I'm guessing he plays at least two years there, then if he and the Rangers think he can make the team, he'll make the jump.