The statement was in a response to a question I asked earlier.

"I was having an issue like this where moz was showing a lot more duplicate content than webmaster tools was, actually webmaster tools showed none, but I was being penalized. I realized this when I added an exclusion to robots.txt to exclude any query strings on my site. After I did this I saw my rankings shoot through the roof."

Thanks for the info. I did edit the settings in the URL parameters section to tell Google that these parameters do not change the page content, so it should now index only one representative URL. My only concern was that the kw (keyword) parameter does change page content for search result pages, but I just read that Matt Cutts encourages disallowing those pages anyway.

Just to verify, disallowing those pages with parameters won't affect the "link juice" passed from external links?

Webmaster Tools correctly identifies the query strings/parameters used in my URLs, but still reports duplicate title tags and meta descriptions for the original URL and the versions with parameters. For example, Webmaster Tools would report duplicates for the following URLs, despite it correctly identifying the "cat_id" and "kw" parameters:

/Mulligan-Practitioner-CD-ROM
/Mulligan-Practitioner-CD-ROM?cat_id=87
/Mulligan-Practitioner-CD-ROM?kw=CROM

Additionally, theses pages have self-referential canonical tags, so I would think I'd be covered, but I recently read that another Mozzer saw a great improvement after disallowing all query/parameter URLs, despite Webmaster Tools not reporting any errors.

As I see it, I have two options:

1. Manually tell Google that these parameters have no effect on page content via the URL Parameters section in Webmaster Tools (in case Google is unable to automatically detect this, and I am being penalized as a result).
2. Add "Disallow: *?" to hide all query/parameter URLs from Google. My concern here is that most backlinks include the parameters, and in some cases these parameter URLs outrank the original.

Any thoughts?

Thanks, Andy! I just tested with Webmaster tool's tester, and it worked.

Is there any way to disallow URLs ending in a certain value? For example, if I have the following product page URL: http://website.com/category/product1, and I want to disallow /category/product1/review, /category/product2/review, etc. without disallowing the product pages themselves, is there any shortcut to do this, or must I disallow each gallery page individually?

I wonder if Moz has recently modified their domain authority algorithm to take into consideration Google's mobile-friendly or "Phantom" updates?