Here is a list of goalies and where they were picked. I will use the top 10 goalies in GAA, Save Percentage and Wins(and if they appear in 2 or more categories I only count them once and they have to play 25+ games to be counted)
Top 10: Loungo, Price, Fleury
1st Round: Ward, Schnieder, Varlamov
2nd Round: Howard, Bryzgalov, Crawford
3rd Round: Quick
4th+ Round: Kiprusoff, Lundqvist, Thomas, Rinne, Vokoun
Free Agent: Hiller
*note: Ryan Miller wasn't top 10 in any category this year but is another late round pick
on the flip side here is Forwards(I use top 20 in points, top 10 in goals and assists)
Top 10: Sedin, Sedin, Stamkos, Ovechkin, Selanne, Staal, Toews, Marleau, Vanek, Kane, Ryan
1st Round: Perry, Iginla, Giroux, Kesler, Getzlaf, Kopitar, Carter, Briere, Grabner
2nd Round: Erikson, Ribeiro
3rd Round: B. Richards, Sharp
4th+ Round: Zetterberg
Free Agent: St. Louis
*note: Datsyuk was injured for 26 games probably would have made the list in 4th+ rounder
basically looking at this list, the group of goalies taken in the first rounder is slightly better then goalies taken in round 2 and after, but in the case of forwards first round forwards are a hell of alot better then ones taken later
It's really hard to rate defensemen based on stats but I will do it on the basis of top 20 scoring and top 10 Time on Ice
Top 10: Pietrangelo, Bouwmeester, Doughty, Whitney, Phaneuf, Suter
1st Round: Seabrook, Burns, Karlsson, Staal
2nd Round: Weber, Goligoski, Keith
3rd Round: Lidstrom, Letang, Chara
4th+ Round: Visnovsky, Yandle, Byfuglien, Wisniewski, Enstrom, Ehrhoff, Kaberle, Liles
Free Agent: Boyle, Rafalski
In general it looks like the best drafting strategy is draft forwards first round, defensemen second round and later and European goalies after the 3rd.