Eh, maybe if you actually got the opportunity to witness the repercussions of your actions, it might help, but you don't get to see any of it.
You have much more control in MGS3 though, unless you're one of those people who believes The Boss and the Cobras lost on purpose.
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Support Barret Wallace (Final Fantasy VII) for Character Battle IX!
http://img687.imageshack.us/img687/3834/banner1barret.jpg