We are still actively working on the spam issue.
InstallGentoo Wiki talk:General rules
A section on reverts might be helpful. Something like:
==Reverts== Try to avoid reverting someone's edits when possible. If a revert is necessary give a rationale for it on the article's talk page. Calmly explain your reasoning. Try to be factual, site reliable sources and come to a consensus or compromise in disputes. Ask for a third opinion and request for comments if necessary. As a last resort ask a wiki admin to resolve the dispute. Use the three-reverts in 24-hours rule (with exemption for vandalism). Do not engage in edit wars.