On this subject, there used to be a website called something like "Rate the DPE"...I just looked, and it seems to have disappeared, which I think is a good thing. I didn't know it existed before my last DPE checkride, but after my instrument checkride, someone noted that I should leave a review there for my DPE. I noticed something about the website: nearly every single person that failed a checkride, would leave a 1 star review, and say how unfair the DPE was, yet every person that passed, would give 5 stars and say they were "tough but fair"...very often it was the same DPE getting these contradictory reviews. DPEs with numerous reviews were all universally 4 stars (reflecting a pass fail rate of about 80%). The site was pointless.