My tried and true way for brown rice is use a pan, bring your liquid to a boil, then put your rice in. Put a little oil or butter in with it to keep it from boiling over. Cover and simmer 45 minutes. Don't ever lift the lid, it makes the rice sticky and you lose heat. I don't soak mine first.
My guess as to what went wrong is that the liquid was not at a full boil and then it did not cook long enough. otherwise your rice would have been cooked in the "soup".
Also, just trying to be helpful, I only saw 2 cups and 4 T of liquid listed, to 2 cups of rice. Just double checking that your ratio was right?