How to overcome a lowball bank appraisals to refinance my home.?

We want to refinance our home with the lowest interest rate now. But the appraisal report totally disappointed us.

The appraiser only took no more than five minutes looking around our house and two days later gave us the report with 6 comps. Three of them are foreclosure houses with the lowest sale price(OF course they are foreclosure). And I can say basically my house value came out base on the two lowest value of the foreclosure homes(As his report said so too). And one of the foreclosure homes is even not comparable. It was on the much smaller lot and 7 years older than my house. Here, I don’t want to mention about how much improvement we put in our house(more than 100K) . The main point here is the other two foreclosure homes equal our house square footage and same floor plan except not much improvement like our house and both houses were abandoned for a while(bank owned). One was sold for 265,000, and the other one sold for 275,000. And he put our house value equal to the one sold for 265,000, but not the one sold for 275,000. All we ask just he could match our house value same as the one sold for 275,000 foreclosure home and just 1 1/2 block away from our house. But he refused with excuse following the guideline etc…..

Now I really want to know what is the guideline for appraisal? Is it just matching your house value with the lowest value of the six comparable houses? Why he didn’t match our house value in the mid range of the six comparable houses? Is this the rule for the house appraisal right now under this distressed market? I am really confused and frustrated.