Denied due to the vague nature of the suggestion.
I have found that someone will always think that something is OP, it is how it is. I'm sure there are Firebenders that think Chiblocking is OP, Chiblockers that think WaterManipulation is OP, etc, etc. Bending does take at least a bit of skill to truly be 'good' at it, at least I like to think so. The elements on their own (before the addons) are generally pretty balanced. All elements have some way of taking out opponents, those that don't have as many ways to do so make up for it through their insane defensive arsenal (airbenders).