Here's the deal: If you don't have any expectations it's worth watching.
Quote from the intro-sequence: "Every morning the President receives a report that updates the most active terrorist threats against the United States. This report is called "The Threat Matrix". The department of Homeland Security handpicked teams of agents from the CIA, FBI and the NSA, to analyze and respond to the Threat Matrix report, now their job is to keep us safe." We follow Special Agent John Kilmer (James Denton) and his team who makes a living out of stopping terrorist in reaching their objectives.
And that is mostly what this show is about. Now I know 24 comes to your mind when you see this but this is not 24 and don't think about 24 when you watch it. You'll be disappointed. This is not a bad show, but it's not a masterpiece. It is, however, entertaining and worth watching if you don't take it all too seriously and think too much about it. The cast is good and the stories are OK. The effects could have been done better, but you buy it. Over all it's well made.