No, Brothers is not a bad movie. I just did not feel all that connected to the overly melodramatic telling of the tale. It is another movie out to manipulate the heartstrings of the audience while ultimately going nowhere. The best moments of the film involve Portman and Gyllenhaal, but it is not enough that I could recommend this movie.
Bottom line. You could do worse, but if you are looking for a movie with true emotional resonance, there are better options out there. Brothers wants you to think it is a deep examination of these individuals' lives, but in the end all we get is some turned topsoil.