I think the exceptional DBA has to go beyond the advanced understanding of the technology and get into the realm of interpersonal dynamics and business decision making.
Do they convey a positive attitude so management and users feel they are approchable?
When asked a technical question they are able to answer in a way that the user can understand?
Can they convince management that purchasing x software package will be a benefit to company?
Can they mentor other DB developers and DBA's?
Can they point out and educate developers on best practices, and if using current code as an example, can they do it without offending someone who may have written the code?
Do they implement new functionality because it makes business sense, not just because it is cool technology that would be fun or great to add to resume?
If there are 20 projects and time to do 10, do they make decisions by themselves, or get other business decision makers input on best use of company time?
Do they put their ego aside when it comes to changing implementations that they developed?
Do they work with other support teams in a cordial way?
The list could go on, but my point is that exceptional DBA's don't work in isolation, they get input from business leaders, and they are open, honest, and patient with others.
-Chuck Lathrope