Prison Break is one of the best shows ever, and the first two seasons prove it. The third season will slightly dissappoint at the beggining, but later on it becomes much better and more in the spirit of Prison Break.
This season has Michael Schfield, Brad Bellick, FBI Agent Alex Mahone and T-Bag incarcerated in Sona, a hellish Panamanian prison, with no gaurds, no order and no chance of escape. I don't want to spoil why, but Michael is forced to try and break out another inmate, James Whistler. This will only be possible if he forges alliances with other inmates, and his brother, Licoln Burrows. Through out the season, you will see Lincoln do seemingly random tasks, which you only understand later on as they escape plan unfolds.
The only things I can find wrong with this season, is that due to the writers strike there are only 13 episodes instead of 22. Also, it would have been much better if they kept up the pace from the second season at the beginning of this one.
Overall, I think that Season 3 of Prison Break is worth it, even if it does very slightly dissapoint. The good news is that Season 4 will be a full season with 22 episodes, and the return of one of the most loved characters in the series.