To be honest, I loved the season at first. I was thrilled with how action packed it all was. But, as time went on, I was getting a bit bummed out. I suddenly realized that it seemed as though they had run out of original ideas and were just heaping in the deaths of main characters to compensate for this lack of creativity. I was really bummed about the deaths of Edgar and Tony. Seemed completely pointless deaths to me. Didn't really help the plot flow at all.
However, since they got out of CTU and Homeland Security came into the picture, it has returned to its thrilling old self again. And only one more main character has died (Sec. of Defense)! Yay! So I'm all about this show once again. Jack is badass!