First off, EVERYTHING is repairable ( at least automotively speaking---flesh and bone do not always heal --so I share the sentiment, already expressed, of being glad no one was injured.)
While evrything can be repaired, it is not always economical to do so. the insurance company will look only at trying to settle for as little as possible. You do not have to settle until you are satisfied, after all if the accident was not your fault, why should you suffer any uncompensated loss? You will have to document the condition of your car, and show that cars in similar condition command values much higher than " average book". If there is any distortion to the unibody structure, it can usually be pulled out on a frame machine. A friend of mine who ran a body shop just loved the way unibodies came back into line if pulled correctly. After the basic structure is straight, its simple a matter of cutting out the old sheet metal and welding in new. It can be done; its simply a matter of cost.