phranque - 4:02 am on Aug 28, 2012 (gmt 0)

http://developers.google.com/webmasters/control-crawl-index/docs/crawlers [developers.google.com]:

AdsBot-Google (Given the special nature of this crawler, only directives for this user-agent are followed.)

therefore, you can use the meta robots noindex on your landing pages and they will be noindexed in the search engines and the general robots exclusion will be ignored by the AdWords review bot.

Robots meta tag and X-Robots-Tag HTTP header specifications:
http://developers.google.com/webmasters/control-crawl-index/docs/robots_meta_tag [developers.google.com]