Kevin Colbert referred to this draft class as being the most immature he has seen in 30 years, however the Steelers have had success drafting young players since Tomlin arrived in 2007.
Kevin Colbert did refer to this draft class as a very immature group however, him and Mike Tomlin have had great success drafting young players. When I say young, I mean an undergraduate or someone 21 years old and younger. It is tough to tell if a player is mentally ready to transition to the NFL, but Colbert has done a great job identifying which undergraduates to select recently. Take Lawrence Timmons for example, he was 20 years old when he was drafted by Pittsburgh and they caught a lot of flac for using the 15th overall pick on him. A lot of people said he was too young and only had one full year of experience of starting in college, however Timmons has become an excellent player for the Steelers, and arguably their most valuable defender. It wasn't just Lawrence Timmons who Colbert pulled the trigger on, but several other youngsters as well. Maurkice Pouncey was only 20 years old when he was drafted as well. Some people aren't huge fans of Pouncey, but you can't deny how impressive he was in 2010, his rookie season. Le'Veon Bell was also an undergraduate last year and was 21 years old at the time he was drafted and like Pouncey, won the Joe Greene award for best overall performance by a rookie.
Even though Colbert says this draft class is immature and young, don't be surprised if the Steelers draft another youngster this year. I'm not sure who that person might be, but Colbert and Tomlin have done a good job when it comes to drafting young players and there's no reason to think they don't have their eye on another young prospect this year.