The MLB Draft is unlike many of the other professional sports leagues. It’s length, immediate impact, and fanfare are all different than the NBA and the NFL. It’s closest relative is the NHL Draft, but in the MLB, not all draft picks can be traded. The success rate of many first-round drafts picks aren’t seen until years down the line, which is what makes it so fun. In the last two decades, the St. Louis Cardinals have been relatively stellar at picking players who eventually wind up as MLB contributors.
However, that fact could be attributed just as much to the minor league development staff of the Cards rather than the people drafting.