I watched the first season, then barely got through the second. Dumped it after 2. Just didn't like it that much, too unrealistic too.
There was a scene where they found a guy's cellphone number (or email, dunno), and the FBI (or whatever 24 works for) could get all his passwords just like that. Via an email.... WTF?! That's just not realistic! Such a turnoff for me personally, hate that exaggerated cyber-power.