At the end of the day it boils down to this . The Steelers defense is not good , at all . The line and linebackers generate no pressure whatsoever on opposing quarterbacks . Its allowing guys like Carson Palmer to look like Ken Stabler which he is not . On top of that , this teams secondary is barely average at best . Ryan Mundy is struggling to say the least and Keenan Lewis is a work in progress at corner . If we ever manage to get Harrison and Polamalu back , it will definitely help , but the question is , how long will they stay healthy ? Harrison missed all the OTA'S , training camp , preseason and now three games of the regular season . When he does return , its going to take some time for him to look like his old self . With Polamalu , can he string together five or six games in a row without getting hurt ? Right now , you really have to wonder if he can . Mike Tomlin has got his work cut out for him this year .