There are problems here on a multitude of levels, but in answering your question, the bottom line is that in any financed deal, the lender will indirectly set the value to some extent in today's market.
As pointed out, many appraisers were attempting to set values according to what was necessary to make the deal happen for the broker. After all, that is who is deciding if they will continue to get the appraisal business or not. This is not as underhanded as it sounds, however -- I do far more refinances than purchases -- but certainly I am not going to go through the motions of putting together a loan before I know if it is even doable, thus the request for a comp and the expectation that this will be the least value we will get. It does not mean the appraiser is dishonest -- my guy will not risk his license. It does, however, mean that a lot were when refi's and sales were at such a high volume that the lenders were not even looking at the appraisal for the most part.
Getting back to the role of the lender -- all lenders are subjecting appraisals to close scrutiny, first applying certain measurements to the basic facts, and then sending it to appraisal review when it does not meet the standards of these new guidelines (and they do not meet them A LOT right now.)
It doesn't matter what the realtor feels it is worth or sometimes even what the buyer is willing to pay, unless they have deep pockets to put down a larger down payment to make up the difference they cannot finance -- the lender will have tremendous influence over the value simply because they control the purse strings. Next to supply and demand, I believe that lender scrutiny of appraised values is now the second largest consideration in what is driving values down in many areas. Some of this is a real correction of 4 years of abuse, and some of it is a knee jerk reaction to what has happened in the industry.
Two big areas they tend to look at with these new guidelines -- what is happening to other sales in that county and that zip, and AVM's, which rely on county records. If you have a unique house in the more rural area of a large zip code, the lender's perception of the value will be tainted by what is happening in the more populous small town that is the center of that zip delivery area, and usually that is that values are going down. If you have an older house that was added to decades ago, and the county records do not reflect those changes (they did not obtain permits back in the days when this was not well policed,) the AVM will kick in and a huge discrepancy will occur in perceived value. Many areas with large numbers of old houses will not have their square footage and number of bedrooms properly reflected in county records. While they once allowed the appraiser to simply comment on these items in an addendum and let the value go through or possibly offered to simply finance at a reduced amount, they are now ordering their own appraisal instead. Their appraisal will absolutely come in lower, for reasons that are yet another point of discussion with regard to the appraisal industry.
The only way you are not subject to such scrutiny is if you have a cookie cutter house in a neighborhood filled with recent sales of like houses.