I watched the Informant on a recent flight, and would agree with the BT review.
Matt Damon pulls off the role of this compulsive liar extremely well, more evidence of his considerable talent at playing a wide range of characters. The film is both funny and uncomfortable to watch as the lies spin out of control, but I never stopped rooting for him.
Scott Bakula was also unexpectedly good in support as a naive CIA agent, and his child-like optimism was touching. You could pretty much pause at the exact times when his heart broke as each lie was uncovered. Having said that, it’s hard to believe a CIA agent could be quite that naive, but then this is only loosely based on reality.