Marriage, at its foundation, requires cooperation, mutual respect, modesty, and concessions. If someone is narcissistic enough to say "my way or the highway" all the time, I don't see how that kind of marriage can work. Sounds more like master and servant than husband and wife. But, if they realize they have a problem and are willing to work on overcoming it the marriage stands a chance.
I agree with the last poster that financial responsibility should be equal. I believe in separate bank accounts and each person having control over their own money after the mutual bills (rent, utilities, etc) are paid. I think when people are talking about narcissistic they are talking about someone uncooperative, controlling, and needing to have everything their own way.