You usually get your better players for the 1st and 2nd rounds (top 60 picks). Each draft year takes at least 3-5 years to evaluate. 5 years for HS players, 3 for college
2002
8. S. Moore (SS, HS)
49. B. Clevlen (OF, HS)
2003
3. K. Sleeth (P, 4-YR)
40. J. Sborz (P, HS)
2004
2. J. Verlander (P, 4-YR)
43. E. Beattie (P, 4-YR)
2005
10. C. Maybin (OF, HS)
2006
6. A. Miller (P, 4-YR)
50. R. Bourquin (3B, 4-YR)
2007
27. R. Porcello (P, HS)
60. B. Hamilton (P, HS)
2008
21. R. Perry (P, 4-YR)
2009
9. J. Turner (P, HS)
58. A. Oliver (P, 4-YR)
2010
44. N. Castellanos (3B, HS)
48. C. Ruffin (P, 4-YR)
2011
NA
2012
NA
2013
20. J. Crawford (P, 4-YR)
48. C. Knebel (P, 4-YR)
2014
23. D. Hill (OF, HS)
13 of the 19 have been pitchers.
9 of 19 have been High Schoolers (high risk). 5 of the 9 have been position players, meaning they have drafted only 1 4-YR position player.
Not many of these picks were used in an effective trade. Again, it is the first 60 or so picks that generally make it. If you have multiple picks, you can reach on a High Schooler here or there.