Competance
OK - so the torture scenes are unrealistic.
But the one thing that makes 24 so much better, is that you know that everything Jack does is for a good purpose, is well thought out, does what needs to be done, doesn't let management/government(s) interfere, and he gets the job done with the care, attention, and consideration of a Midwife who works part time for Amnesty International.
Now... the US Military....