One that tells you the truth, not just "things that are true"?
For example, don't just tell us he said, and she said, and leave us to try to figure it out. Investigate until you know who's right, and why, and tell us.
I really wouldn't -- there are orders of magnitude more facts in the world than I have time to digest, so it certainly helps having a basis of analysis, even if sometimes that analysis is misguided.
