I think the difference between Sleeper Cell and 24 lies in the fact that one is on a pay cable network and the other is on free TV. Sleeper Cell is more thoughtful, spends more time on character development and on plot, things that typically are poison for the mass market, free TV audience. 24, by contrast, is almost all about action and suspense. 24 needs to keep advertisers happy by capturing the eyeballs of the all-important 18-30 demographic. So believability is less important than keeping the viewer on the edge of his/her seat. Sleeper Cell is a better show by a wide margin, in my opinion.