I was in Sarajevo at the time (7 years old) and the movie is pretty accurate.
Uniforms and bad accents don't matter, its a good story, especially the trench type of warfare that was fought. A bit different from the blitzkrieg style campaigns that we see now days over the TV in Iraq and Afghanistan.
There are a lot of small details that make it very realistic, like the wood for burning during the winter stockpiled in the appartments, the way people die, living conditions in general, no water, no electricity, barelly enough food, etc
Somethimes that period of my life seems like it was only a dream...