In 18 of the 28 seasons beginning from 1990-91, the Atlanta Hawks have been able to reach postseason play. Also during that time though, they have never reached the NBA Finals and have only reached the Eastern Conference Finals once.
While they have had periods of prolonged success, perhaps the lacking of a transcendent player drafted in that timeframe has been part of the reason they haven't reached the grandest of heights. That doesn't mean they haven't selected anyone who played a largely positive role with the franchise.
Here are the Hawks' 10 best draft choices since 1990. As a subjective list, the order and players on it could surely be debated.
In order to make the list, the player must have been actually drafted by the team (Trae Young was actually drafted by the Dallas Mavericks before being sent to Atlanta in a draft-day deal). Only impact with the Hawks was taken into account (while Jason Terry had an impressive 19-year career, only his first five seasons were played with the Hawks). It's also not exactly a list of the top-10 players drafted by the Hawks since 1990, as where the player was drafted could influence where they end up on the list (a second-round player who had about as much impact as a first-round player will end up higher on the list). The team's draft picks were taken from Basketball Reference.
Al Horford - 1st round, 3rd overall (2007)
Spending his first nine seasons with Atlanta, Horford was named to four All-Star teams and was an All-NBA Third Team member for the 2010-11 season.
Josh Smith - 1st round, 17th overall (2004)
While fans weren't always fond of his shot selection, Smith's all-around game produced averages of 15.3 points, 8.0 rebounds, 3.2 assists, 1.3 steals, and 2.1 blocks in nine seasons with Atlanta.