A long held tradition in the hardware reviewing world is to accuse reviewers of biasing their reviews by only running the benchmarks that the manufacturer wants you to run and providing slanted results.  It really doesn’t matter if every single site comes out with similar results, for some if a review doesn’t fit their personal bias it is obviously flawed.  As [H]ard|OCP mentions, there was a time when Reviewer’s Guides did resemble something along those lines but they have changed over time as suppliers realize the more biased they attempt to make their guidelines, the less likely a review site is to follow them. 

These guides are now more of a mix between a white paper and a lengthy PR release, with relatively in depth discussions on the capabilities of the product along with highlights of what the company feels are the key features on the new product.  [H] has posted the document which arrived with their GTX 680, discussing features and yes … suggesting the appropriate games with which to show off their cards features, though what game could you test PhysX with other than Batman?

"Many times we have been asked what exactly CPU and GPU companies "require" of us when working on a review of yet-to-be-released hardware. Published here is the Reviewers Guide from the recent NVIDIA GeForce GTX 680 launch in its entirety. Besides it being a great geeked-out read, you will likely learn a few things."

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