There are laws to protect you on this, they are obliged to get the best price possible. But all that really does is to stop them giving it away, as long as they have made reasonable attempts to sell at a reasonable price thats OK.
The problem with property is that it's difficult to say what the "value" is, it's essentially the price somebody is willing to pay, most houses in the situation you mention are sold by auction so what somebody pays can vary a fair bit.