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Surprisingly, drafting d-men on the 1st round has been a successful strategy .
A review of drafts from 1979 (the first year of the "Entry Draft") through 2002 shows that of 190 defensemen drafted on the first round, 140 or 73% have played at least 200 NHL games to date. 37 have played in at least one All-Star game. By comparison, 65% of forwards drafted on the first round have played at least 200 games. Considering that defensemen are competing for half as many open positions on a standard NHL roster, this difference is significant. It's also surprising given that there is general agreement that defensemen take longer to develop and because of the greater emphasis on offense in junior hockey.
Looking at the composition of today's NHL, 80 of the top 220 defensemen (in TOI) in 2007-8 were picked on the first round. The remaining 140 players came from a more or less normal distribution of the remaining draft rounds and free agents. To summarize, this research shows that the talents and skills that make for an NHL caliber defenseman are being accurately identified and ranked by draft order.