We had pre-marital counseling and it didn't do a thing. Mostly because the assistant pastor who did it was a flake and didn't really invest much time or thought into it, and he wasn't married either!! He just had us do a workbook and then lightly discuss it. We learned a few things about each other, but other than that, it didn't help. (Needless to say, the assistant pastor was fired a few months later for stealing from the youth fund!!!)
I do, however, recommend pre-marital counseling for everyone. As long as you don't get someone who's married and has good standing in the church, I think it is extremely beneficial. At least it doesn't hurt!!