Brown rice is fine and far better then white rice. There is no reason to cut it out so long as it fits into your overall calorie needs. AKA fits into your macro breakdown.
The GI rating once combined with say a complete protein will be negligible to say the least. No need to worry about that unless your eating it alone with no other food.
I might of got this wrong but brown rice is just as good as white rice. They are just made from different colour grain. The thing that makes brown rice better is if it is whole grain. Whole grain is better then white rice but brown rice is just a different colour grain.
wow! I stand corrected