I believe this community is about providing Quality answers and questions to all issues pertaining to Ubuntu and the Ubuntu family. Something like "*Quality answers for human beings*" comes to mind when thinking in short what we aim to do here. In addition to quality (which I believe goes hand-in-hand with Quality) is Authoritative.

So more along the lines of:

"This site's aim is to provide Correct and concise answers of the highest quality for users of Ubuntu - and it's derivatives."