Do you buy links on Authority Sites and PBNs who claim you're getting "unique" and "hand written" content? Ever wonder why some do well and some just give zero boost to spite metrics? Crappy content might be the root, and I've found a couple really good steps to find out. 1) To start off simply copy a few sentences one at a time and paste them into Google with quotes around them. Obviously if they show up on multiple sites you've got shit content, but if Google can't find an exact match it will yield results WITHOUT the quotes and you may be able to notice suspiciously similar sentences that have been obviously spun. 2) Next check for basic Plagiarism with http://www.plagscan.com/seesources/analyse.php This does a internet sweep and lets you see if it's essentially stolen content. This won't uncover all the shitty content, however, so thats why we do the next step. 3) Paste the URL into http://www.siteliner.com and sit back and watch. It takes a little while (let it finish), but it comes up with some great insights that can catch auto-generated and spun content. After it digests the content it gives you graphs and tells you EXACTLY what percentage of the content is duplicate, and better yet what percentage is "Common Content." This is AMAZING at ferreting out auto-generated and spun content because you'll often see a large footprint of "Common Content" and duplicate content... as opposed to unique content. I believe that this is more closer to how Google analyses content as it tries to weed out spun content. Chances are that one of these will raise some flag if you've been fed crap content. You'd be surprised at how often I've paid for original content and discovered its anything but. Good luck all!