MUCH Better Than Angie’s List, Yelp, Facebook, etc.
“What’s sauce for the goose is sauce for the gander.”
–Idiom
In “Good Lender Service, Defined,” I noted that if you want the real scoop on a lender, ask a Realtor who’s previously worked with them.
Of course, the reverse is true, too.
Namely, if you want to know if a specific Realtor is skilled, conscientious, attentive, etc . . . ask a lender who’s done a deal with them.
Equally good: asking a Realtor who’s worked with them on the other side of a deal.
Dancing Around Defamation
Especially if the assessment is negative, I find such “quiet,” informal channels more reliable, because anyone 
sophisticated knows that “flaming” someone (publicly skewering them online, in writing ) invites a defamation lawsuit (legal trivia: slander is oral, libel is written).
It’s also the case that a skilled interlocutor will elicit better and “juicier” info about their subject than someone less subtle.
So, “How good (or bad) a job did the Realtor do?” may simply be met with a “no comment.”
Much better (and safer) to ask: “Would you like to work with them again?,” or, “Would you refer them to a friend?”
