But why the minimum score ...?

In general, this note is to sanction practices of publishers, with demos increasingly rare or -it novelty introduced by Ground Zeroes- downright charged.
Certainly, I understand that one can appreciate can lay hands on this new Metal Gear Solid a good year before its release, but before you buy, ask yourself the question if you really want to validate this new economic model from publishers.

For those who wonder what it looks like, it happens nothing really capital during this "prologue" (this term has also tricked person on its content). This pre-MGS5 is primarily there to allow players to get familiar with the gameplay and filled the same specifications as a good demo. Now, for you to see if you can (or want) you to put 30 for an hour of play.