Chatterbug and Someday make excellent points -- in my experience most MC's suck -- there is no criteria for measuring a good one from a bad one and even the counselors are not usually aware of their success rate because people don't pay them after the fact to give them updates.
Here's the best plan I have come up with for engaging one:
-- Get a recommendation if you can -- Find one who is "solution based" -- Call them, tell them you will e-mail a summary of your situation and want to understand what their strategy will be before engaging. -- E-mail the summary -- Call and discuss their feelings on your sitch and the approach they would take. -- Speak to at least 3 -- Go to the first appointment by yourself and explain what YOU want to accomplish and what you want to avoid. Be open to letting them influence your thinking but don't get steamrolled.
Definitely don't cut corners, it's high stakes. During the session, be very careful about what you reveal and what you keep to yourself.
Accuray
Married 18, Together 20, Now Divorced M: 48, W: 50, D: 18, S: 16, D: 12 Bomb Dropped (EA, D): 7/13/11 Start Reconcile: 8/15/11 Bomb Dropped (EA, D): 5/1/2014 (Divorced) In a New Relationship: 3/2015