And I'm amazed that some people are so feeble minded that they read something the first week and then just keep repeating it to themselves until they believe it.
Al Johnson was not the problem with the OL. Pettiti had a really rough first year, Rivera never showed the same ability he did in Green Bay (maybe the injury, maybe signing bonus malaise), there are more plays when Allen doesn't touch a defender than when he does, Gurode had 3-4 mental breakdowns a series, Tucker isn't physically talented enough to play LT for an extended period, Campbell had a really down year, heck even Witten was so bad blocking that they'd leave K. Johnson in because he at least made an effort.
Pick any two games of the season, rewatch them, concentrating on whose defender made the tackle on any given running play. I think you'll be amazed at who was doing what consistently. I know I did and the only things I saw similar in both games was that alot of running plays that I initially blamed Pettiti on, I saw that it was really poor TE blocking and Allen stands around alot.