The theme of a grizzled mentor and a hyper-energetic but gullible new recruit is a somewhat dated one (in recent memory, Spy Game, Training Day etc) but I watched this movie with no expectations, and found that it does a fairly good job of being fastpaced and gripping.
What rides it above the predictability that could have drawn it down is its riveting pace. Glossy visuals are a plus too. The eminently watchable Pacino is no slouch in the charisma department as usual. Farrell merits a special mention, he maintains a credible dignity that lends a certain cachet to the movie, and his chemistry with Moynahan is searing.
Last but not the least, there are not-so-subtle references to recent CIA glitches, most likely 911 and Gulf War.
You'll probably not watch this flick more than once, but it's a decent rental for the first time. The extras on the DVD include some deleted scenes that reassured me that the movie is very well edited. Which helps.