As an enormous MGS fan I'm suffering a reasonable level of butthurt over this, though I'd never pretend that I'm not going to pre-order the ridiculous Collector's Edition and play it a million times. I like David Hayter a lot, I don't think he's turned in a bad performance yet, and I've never thought much of him as an actor, but I still think he'll probably be fine. He's never going to be THE Snake to me, but I'll get over it.
Others seem to take issue with the voice acting, but to me the thing that holds Snake back from being a better character falls squarely on Kojima. Snake's best moments are in MGS2, when we get to see him from a different point of view, because when he's the protagonist of the game he really exhibits almost no personality at all. The old joke is that he just repeats the last words said to him and puts a question mark on the end, but by MGS4 he can't even manage that. Can anyone tell me Snake's motivation for doing what he did in MGS4? At no point in that game does he ever talk about his own ideology, or his reasons for going on. Liquid monologues at him at
great length about his plans and his world view, and all Snake ever does is interrupt him with a husky "LIQUID!" every now and then, followed up with nothing of substance.
His only lines in that game are one-word interjections or explanations of what he needs from someone, and the rest of the time he just stands there in stunned silence. Otacon, Naomi, Big Mama, Big Boss, Drebin, Liquid, Meryl - they all vomit soliloquies at him for hours, cutting away to flowcharts and infographics when necessary, and Snake just looks blankly back at them with his mouth open. If you wanted to get some use out of your degree you might read into it and say that it's representative of Snake having given up on life, just going through the motions to fix his last mistake, I suppose. I think it's more likely that Kojima's just a bad writer of dialogue. It sure isn't David Hayter's fault that his scripts are mostly empty
So, hopefully Kojima doesn't think that a bigger name actor is going to make that problem go away. Obviously we won't be able to appreciate the nuances of the script until the full game comes out, but I still can't wait for that MGSV trailer.