Well really everything is OP if you take it to a biological level. If you can apply and remove heat to a single part of the body you can easily kill someone. Air lets you remove oxygen from someone's lungs. Lighting can make a bolt inside somebody's body or mere milliseconds from hitting them. Light allows you to permanently blind someone with ease. Anything is overpowered with proper usage. I assume the GM is assuming we will use our powers in a far more simple light.