MC does work. HOWEVER, both people have to be in the right state of mind for it to work. If your W chooses to not be honest, it's not the counseling's fault for not working. It's your W's.
I was getting a lot of feedback on this board telling me that MC had the potential to drag MLC out longer. Maybe if we'd sought MC years before this happened it might have mitigated things to some extent but it seems like once someone has gone into the tunnel of MLC, MC isn't going to pull them back out...
Our marriage had problems, just like any marriage does. But they didn't land me here... people fix those sorts of problems all the time (she complained in MC about me sometimes putting a dish in the sink instead of the washer - it was that level of stuff that she was using to try and justify having and affair and leaving).
