It feels like this movie was killed in the editing room
I should start off by saying that The Informers was not a good movie. Too many plot strands, not enough story development, no arc to the characters. However, there are small bits throughout the film that hint at the possibility that this could have been a really good movie.
I haven't read the book, but it feels like a lot of scenes for The Informers was left on the cutting floor. 98 minutes is just WAY too short for a movie with so many inter-connecting plots. The movie chugs along for two acts and then just fizzles out with indifference, like there was a ton of stuff cut out. I think if they added another 30-40 minutes worth of scenes, they could have really fleshed everything out more. As it stands, The Informers is just a tepid bore.