I think the original idea was that articles would be written by the people involved; outsiders have been contributing more mainly because there aren't enough insiders editing the wiki. Within the existing structure, the best thing to do is add a note on the talk page about the limits/bias of your knowledge and get another pair of eyes on the article. You can also disclaim opinions on the article itself, like: "Some fans [i.e. this editor, grey-bard] feel X about Y." I've gone ahead and added things that were speculation on my part [with a note], hoping that someone else would see and add/modify it. I'm not sure if that's the right approach, though.
Should we create a "bias" template for articles that don't provide enough alternate viewpoints?
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Should we create a "bias" template for articles that don't provide enough alternate viewpoints?