If someone hit you, then they are liable to cover the cost of the repairs. Hopefully they have at a minimum, 3rd party. At a glance, it doesn't look too bad, but considering that the damage includes the rear arch/door guard, it will increase the cost of the repair significantly.
Disregard what you paid for hte car 2 years ago, look at what the car is currently insured for. Once you figure that out, you will get an idea of how much damage will be required to write it off. In my opinion, it will not be a right off, but the damage to the reat makes it a bit more difficult to judge.