I have no tolerance for watching TV series on the network's schedule. If a series gets good reviews, I will watch it on DVD (e.g. Serenity, Deadwood, Rome, Sopranos, Alias, Wonderfalls, etc). In this same vain, I watched the first season of 24 straight through and really enjoyed it. The second season was OK but weaker and less believable (even a hard-core libertarian paranoiac like myself had trouble buying the cabinet coup). Plus I got about the same feeling when the Kim Bauer character was on-screen as I did when there was Anakin-Padme dialog in the last Star Wars movie.
So I am a third of the way through season 3 and I am having trouble really getting into it -- maybe the threat is not immediate enough at the mid-point. Should I stick it out? Is there anything out there left worth seeing? Is there anything interesting in seasons 4 or 5 that bring back what made the first season great?