In the years since Open Door moved into the Phoenix market, I have seen a number of Open Door offers, as have some agents I know. Not one has been anywhere near fair market value, once all the BS fees are removed.
We sold our home in the Phoenix area almost 1 year ago. After interviewing several realtors we decided to sell to Open Door. Our net after fees was 6% greater than what the realtors had considered to be fair market value and we were able to push our closing date out 90 days. Additionally, we were spared the expense of having to repaint the home's interior - as recommended by the realtors. No hassles of showings, etc.
I'm sure that others have had experiences different than ours as you have indicated, however, we were completely satisfied with the entire process and outcome.