Blake Coleman is a really good player and most NHL players do not get to be as good as him. I suggest, if you're more inclined, to take a look at the last 6 picks of the drafts between 2009 and 2013:
2009: Caron, Palmieri, Paradis, Olsen, Ashton, Despres. Palmieri is the only one still in the NHL. Despres had concussion problems but was a 4/5th defenseman
2010: Howden, Kuznetsov, Coyle, Visentin, Etem, Nelson. Nelson, Kuznetsov, and Coyle are excelling, the other 3 are not in the NHL.
2011: Percy, Namestnikov, Danault, Phillips, Jensen, Rakell - Namestnikov is a fine top 9 player, Danault's good, Rakell's good, the other 3 aren't in the NHL
2012: Schmaltz, Gaunce, Samuelsson, Skjei, Matteau, Pearson - Skjei and Pearson are NHLers, the other 4 are not.
2013: McCarron, Dano, Theodore, Klimchuk, Dickinson, Hartman - Theodore is a very solid D man, Dickinson and Hartman are NHLers but with limited impact.
Most of these guys were really good in junior (or college, or wherever). Many of these guys were really good in the AHL, too. The majority of them do not play in the NHL now. I like Nolan Foote, I'm glad the Devils have him and I'm glad they made the trade. But the odds are still against him becoming a full-time NHLer.