I think surnames should be available as an option, but I dislike the fact that we're all forced to use them.

Back before release, Tanaka said surnames were implemented to ensure players can always get the name they want. Well guess what, SE? The name I want is only ONE name! Forcing me to use two names takes away my freedom to use the name I truly want.

I understand some people might run into issues if the name they want is already taken, and so surnames should be available as an optional choice for them, but for the rest of us they're just unnecessary and obtrusive.