Are the Steelers among the worst draft teams since 2006

Forbes.com conducted a survey of drafts for all 32 NFL teams since 2006
How they conducted the poll: Looked at the percentage of players from those three draft classes who were still listed as active members of the team and All-Pro’s on the team.
Best Draft team according to the poll
1. Houston Texans – “have kept on their current roster an amazing 85% of the players they’ve drafted in the last three years. The Texans have also produced two All-Pros (linebacker DeMeco Ryans and defensive end Mario Williams). But the Texans’ record over the last three years is a less-than-mediocre 22-26.” – forbes.com
2. Indianapolis Colts
3. New York Giants – The Giants have held on to 90% of their draft picks from the past three years – Forbes.com
Worst Draft Team
1. New England Patriots – Fast Fact – 39-9 record in the past three years.
2. St. Louis Rams
3. Pittsburgh Steelers – “The world champion Pittsburgh Steelers, with only 58% of their drafted players still on the team and no All-Pros among them.
Like the Patriots, the perennially contending Steelers usually have a low draft spot, but they have fulfilled their needs by finding and developing excellent undrafted rookies over the years, like running back Willie Parker and linebacker James Harrison, the 2008 defensive player of the year.”
Analysis: With the Patriots and Steelers being rated as three of the worst draft teams since 2006, draft day success means little for the short term. Case in the point the Steelers received minimal production their 2008 draft class and won the Super Bowl.