I am not a vet but have been reading about your sitch so i thought i could at least offer some advice based on my experiences with both my W and I going to MC.
In my opinion and i firmly believe this is what happens:
MC was probably the single biggest reason why my wife filed for divorce.
We only made it to 3 sessions, but she already had her foot out the door before the first one. She basically admitted it to me after.
The counselor spent the sessions trying to dig up our past rather than offering soulutions for the future.
My wife was seeing an IC previously and i suggested we both see a MC. I soon learned after that she had already talked to her friends and sister about possibly filing for D.
I am convinced that she agreed to go to MC so that she could tell all her friends and family that we tried everything to save our M, when in fact she had already made up her mind.
I am not here to tell you MC doesnt work, but if only one person is willing to do the work, it will NOT help at all.
I would tell anyone considering MC to give it some serious thought before both of you go, because if your W says she is not happy, MC will NOT help.
Just my opinion, hope it helps.
Me: 41 W: 36 M:9 yrs Together: 12 yrs Kids S7 S4 BD: 01/13 W filed 5/13 D final 8/13