The Steelers have the same problems year after year. Poor offensive line play. No pass rush. No turnovers. Now they can't stop the run game. It doesn't get better after they try to fix it either. They have changed players and changed position coaches and coordinators, meaning there is only one constant when it comes to the offense. The defensive staff was together for years and perennially had one of the best defenses in the entire league, then they shifted their drafting strategy and look at the personnel we have on the field now. Some of the guys wouldn't cut it as backups for the teams of the 2000s.
Look at the first round draft picks:
2000 - Plaxico Burress - Solid receiver with a productive career, though most outside of Pittsburgh
2001 - Casey Hampton - Foundation of the defense for a decade
2002 - Kendall Simmons - Health took his career right when he appeared to be poised for breakout season
2003 - Troy Polamalu - One of the top safeties of his era and still one of the best players on the team
2004 - Ben Roethlisberger - One of the best players in franchise history
2005 - Heath Miller - One of the top all-around tight ends in the league
2006 - Santonio Holmes - Playmaker and Super Bowl MVP
2007 - Lawrence Timmons - Slow development track, one of best defenders but not an elite playmaker
2008 - Rashard Mendenhall - Disappointment. Never seemed to have the passion for the game
2009 - Ziggy Hood - Never a fit for the defense
2010 - Maurkice Pouncey - Never lived up to his rookie season, but not the awful center some think he is IMO
2011 - Cameron Heyward - Long development track, disappointing in what was supposed to be his big year
2012 - David DeCastro - Looked to be on verge of Pro Bowl year, but hasn't been dominant yet this year
2013 - Jarvis Jones - Struggled as a rookie, has looked better than Worilds year two (which is not saying much)
2014 - Ryan Shazier - Too early to tell, but was a relatively surprising pick