From Frederica Mathewes-Greene:

The hyphenated name wasn’t a noble experiment, it was just a sign of the times, good for a few laughs, a few scrapbook pages of mangled address labels. It wasn’t the important thing. So if you’re planning a wedding right now my advice is: Don’t plan a wedding. Plan a marriage instead. Make it wonderful, and when it isn’t wonderful, make it last.
And no matter how romantic it sounds, a hyphenated name will only give you headaches. Oh, what a tangled web we create, when first we practice to hyphenate.