I have a feeling the Twitter mob from every 3rd of the month is making sure that the steam reviews remain solid, regardless. After all the time and effort the community has put into this, I would say just about any online review submission platform is going to have good reviews.
On the Metacritic side of things, it doesnt look like all the main outlet reviews are available yet, for what ever that is worth. I am more personally curious of what new players opinions are of this thing, but I seem to be running into more long time fan reviews. Perhaps the long time fans are posting reviews early and new comers still arent finished with the games yet?