This show was incredible in the first season. It had the great emotional story line, about Michael trying to break his brother out of prison, to save him from death penalty for a crime he dint commit. Thee casy was amazing, and realistic acting made this show so very good.
Story developed pretty well over the 4 seasons, but in my opinion, going back to a prison story in season three was a huge mistake. And whats the thing about using half a season making a plan and execute it only to see it fail, then you do the same thing in the other half of the season. This was also the plan for season 3, but because of the writers strike, they had the failed try in the 6th or 7th episode and the one where they succeed in the 13th and last episode. Ridicilous is the only word to describe it. So extremely predictable.
The thing that makes me give the show a 9, is the end of the series, and the movie they made. The endings for both were incredible to say the least.