Season 1 is a flop in my eyes but it really gets amazing. Keifer Sutherland proves his one of the best actors around with his performances is ever single episode. My favorite season from 1-8 (1 being the best) is 1.day 3 2.day 5 3.day 2 4.day 7 5.day 6 6.day 8 7.day 4 8.day 1 but all seasons except season 4 and 1 are great. I personally loved Kate warner from season 2 who was a really brave women but sadly she didn't continue. I also really like Jack's daughter but she gets annoying with the idea of always getting lost but she was great. seasons never get boring, you even sometimes want to totally watch some scenes more than once.