Having seen Sutter coach the last two years with the Devils I can say that the younger players are going to benefit from having him there. I don't think it's a coincidence that Parise, Zajac, Clarkson, and Oduya have all come along so well the last couple years. Parise would have been fine no matter who the coach was, but I think Sutter did a lot of good work with him and the other young guys. That's probably the one thing I'll miss the most about him.
Whether or not he can get the job done in the playoffs I'm not sure. For some mind-boggling reason Sutter went back to the linematching the Devils were known for for years, after getting away from it for most of the regular season. But that could just be his inexperience at the NHL level.