Why do people keep claiming MGS4 is PS3's saviour?

[jerseyboy609]

jerseyboy609 said:
well, scheck out my post and see for yourself how many people are buying hardware and software from my post...thats why I made it :)

Who's buying MGS4?
http://www.vgchartz.com/forum/thread.php?id=28145&start=50

and thats off of this site alone