A quick heads-up to everyone:
Anyone claiming to have received an advance review copy of MGS4 is either lying or has stolen a copy from the shipments currently going out to retailers. Nitroid spoke with Ryan Payton recently about this in some length and according to him, because of the high profile of this title, not even members of the press are being given review copies. Any early play-through of the game is either done at specified events hosted by Konami (for example, the MGS4 boot-camp or the recent event in Paris) or not at all. With as vague a level of information as most of the early reviews in various magazines have been supplying, there are a lot of people who are out looking to garner attention for themselves by either claiming to have received an early copy or by stealing from early shipments through various means. In addition, anyone who manages to snag an early copy by any means will undergo a certain level of investigation by Konami representatives, should they catch wind of it.
For the good of the fan community, don't give these people the benefit of your attent.