tedster - 3:28 am on Sep 8, 2012 (gmt 0)
I do see what you mean. But, from that report, I don't easily see how many URLs that I would consider "duplicate" are also being included. With a sitemap I know what percentage of URLs that I WANT to see indexed are actually in there.
The "Ever Crawled" stat is a help in this direction, but that information doesn't get granular enough for my purposes with some sites. If the site is technically "locked down" to avoid the various canonical errors and so on, then the report you point to is OK, I guess.