That was a pretty lame ending.
NOTE: DO NOT READ UNLESS YOU HAVE SEEN THE LAST EPISODE OF THE SERIES, OR DON'T GIVE TWO SHITS ABOUT THIS SHOW.
Bringing back Kellerman was a huge deus ex machina. There was no explanation as to how he survived, and he came back and solved everyone's problems. I really liked that character in season 2, but this was a shitty way to bring him back.
Also, what was the deal with T-bag? They were starting to redeem him in season 3, then he just reverts back to the way he was back in prison. I thought they'd have him sacrifice himself in order to save everyone or something. Instead, he gets back into his rapist mindset.
And showing Michael dead at the end was dumb.
The best part of the episode, I thought, was Donald Self. He made season 4 tolerable. Him writing "kiss my ass" was just awesome. I thought the writers did a great job with that character.
NOTE: DO NOT READ UNLESS YOU HAVE SEEN THE LAST EPISODE OF THE SERIES, OR DON'T GIVE TWO SHITS ABOUT THIS SHOW.