I finally watched through the last few episodes of Alias. The final season got more interesting after Jennifer Garner had her Aflack love child, as she was able to do club scenes in wigs again. The new characters got totally put on the back burner. They wrapped up a lot of loose ends too quickly.
Still, it was entertaining. The show ran its course and really got so complex that I would have a hard time summarizing it to someone. I can't even remember the overall story arc myself. The five seasons actually spanned something like seven years, so a lot went on.
That's the funny thing when you think about how 24 is written. It started about the same year, but with only one physical day taking place in any given season, you don't have to worry about making some complicated and far reaching story arc. There are plenty of twists in just 24 hours.
I bet writing for TV is hard. That's probably why there are at least a half-dozen writers on any given show. I can't even come up with a solid 20-page short that won't suck! :)