And it was worth the wait! In "I Will Miss Jack Bauer" I wrote about the series when it ended four years ago. I think it still holds up today. 24 isn't as groundbreaking as it was in 2001 when it began. Back then you didn't have many, if any, television series killing off main characters, or letting their hero engage in acts some viewers would surely find reprehensible (torture). But it is still enjoyable and unique in its fast minute by minute pacing.
I realized one thing tonight that I don't know how I missed until now -- Showtime's excellent Homeland series owes a lot to 24. I'd go so far as to say there would never have been a Homeland without 24.
For a super fun rundown, visit Dave Barry's blog.