The 2nd round hasn't exactly been a money pick for the Steelers in recent history. Marcus Gilbert was Pittsburgh's 2nd round choice in 2011 and he's certainly earned his money and has a bright future. In 2010 they chose LB Jason Worilds who did see significant playing time with the injuries to James Harrison and Lamarr Woodley but still had his share of struggles.
2009 and 2008 were 2nd round draft picks to forget; the Steelers took Kraig Urbik and Limas Sweed respectively, neither of which are on the team any more. You have to go back to 2007 to find the most successful Steelers 2nd round draft pick of the Mike Tomlin era. His first year as the Steelers head coach and they choose Lamarr Woodley.
You can make a case that the 3rd round choices of the Mike Tomlin regime have worked out exponentially better than the 2nd round picks. Mike Wallace, Curtis Brown, Emmanuel Sanders, etc. You can see a full list here.
Normally a player selected in this round is a supposed to be someone you can count on for years to come and shouldn't be overlooked as a potential day one starter depending on your situation. It would behoove the Steelers in this years' draft to hit this one out the park.