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You want to know no if there is a way of grading a landing page vs grading a keyword? Absolutely you can use the campaign who in seomoz and you can find the individual pages and find how well the page is ranked for that keyword. If the landing pages rank very high for the keyword and is not optimized well keyword then it is most likely something other than the landing page However if the landing page is optimized well for the keyword is most likely because of your good work with the landing page It is pretty easy to determine as long is the keyword is not a exact match domain even still you can use the on page SEO and link tools to determine how well the page is made. I hope I have been of help. Sincerely, Thomas