Hi OP-
I think it is a good sign that your W is willing to go to MC however, please keep your expectations at zero. I know you know a little about my sitch. My H and I have been going to MC somewhat consistantly for almost 2 years. Our relationship and ability to communicate has improved but the M isn't the problem. It is possible that MC will help your W see some of her own issues so I don't think it is a waste of time. I've just learned that MC isn't necessarily the most direct route to solving the real problem.

Good luck.