Prison Break has been a very uneven show. Most of the first season was good, but the second season was horrible. The third season managed to recover somewhat, and get good again near the end. Of course, the main problem is that you can only break out of maximum security prisons so many times before it gets old and contrived, and/or they just lock you in a hole.
Season four starts by wiping away most of what they set up at the end of season three. Everyone is out of prison, some of the non-core characters from the last season get killed or sent away, and Sara turns out to be alive. While I’m not a big fan of retconning out significant events, I think the show is better with Sara, and the way they brought her back was believable enough I’ll give them a pass this time.
Rather than trying to escape, or being on the run, this time they are assembled, working as an off the books unit for Homeland Security trying to take down “the company” (possibly the stupidest conspiracy name ever). It works well in the first two episodes so far, and they manage to keep the pace up, which has been a problem for the show in the past. It’s a good setup, since it means they are trying to break into places rather than out of them. They also have almost everyone in the same place, which works a lot better than the scattered stories of the previous seasons.
I was pleasantly surprised by how good the first two episodes were, and how well the new setup works. They could easily keep it going for at least a season without getting old.