Mostly just the general formatting of articles - keeping consistent section titles and using the headers etc...
Also, it would be nice to mention something about trying to be objective when writing articles - articles that completely shit all over a game/gush all over a game are pretty awful.
In terms of actual sections - maybe something about writing plot summaries and keeping them concise (as oppose to writing 1000 words detailing all minute details of the story)
I'm on board with that too. Bringing agendas both positive or negative into wiki's isn't what they are for. Wiki's are for straight up information and nothing more.