Indeed. Blaming the review sites is hilarious.
Well it is their fault as well because they could have waited till the units, which they got get the update first, especially considering some review sites have said that this isn't the final software for the public release and being so called "experts" in the tech. field they should know how much of a difference optimised software can make in every single area, but instead they decided to rush the review out because they want traffic, simple really.
And if they really had to be first to the internet with some info on the new nexus, then they shouldn't have called it a review, rather a "preview" or "hands on" and stated in the first paragraph that they were running an old version of 4.2 and that there is an update coming out before the public release, which could improve every area, but they didn't.
If I had received the handset to review and knew that there was an update just around the corner, which could improve/fix issues (especially after reading about performance, battery issues etc.) then I would have waited for that update before starting a full on review.
Google = shouldn't have sent phones out with old software
Review sites = should have waited for the new software before doing a full "review" or done the above
Thinking it is only google's fault is hilarious