I have no way to describe this movie other than "testosterone filled, emotionally engaging".

The two brother's characters are not only believable, but incredibly sympathetic, and their acting gives them far more than just life, it gives them soul (and the side cast, particularly the father and wife, more than just fulfill their roles). While most of the fights (sans the last one) are predictable, they are still completely engrossing, and the last fight simply goes beyond being just a climatic fight and the emotional punch it carries traps you until the very end.