Just an FYI for anybody at Google with write access to the API website: Go here: http://www.google.com/apis/adwords/developer/adwords_api_services.html. In all three views, the link to the WSDL for the Criterion service actually links to the WSDL for the Adgroup service. I.e. it would say "https://adwords.google.com/api/adwords/v2/CriterionService?wsdl" but link to https://adwords.google.com/api/adwords/v2/AdGroupService?wsdl...