Ed Bouchette writes an article in the Post Gazette in which Joe Greene shares his opinions on the Steelers offense of recent years. This is the link to the article:

http://www.post-gazette.com/pg/12035/1208112-66-0.stm

There is nothing he says that hasn't been discussed at length in various critiques of the BA offense before, such as:

• It's not about the ratio of run to pass, but the commitment to the run. You don't just call the run because someone told you to.
  
• The offense was too predictable. You could tell when the pass was coming and when the run was coming.
• Inability to control the clock late in the game - keeping too many opponents in the game for too long.

I recommend the read. It's a good set of observations coming from a well-placed observer.