Yeah, he's an actor, too. See, I'm against changing actors when a series is going on, too. I wish Michael Keaton along with the first two Batman movies' staff had came back in the 90's to do Batman 3, with a better script than Batman Returns (and Forever :s)... But, oh time awarded us with better Batman movies. Still, I like Keaton the most.
Anyway, they've chosen this guy to fully portray Payne and I don't oppose the situation. Yes, they're changing lots of things, the main model actor being one of them. So what? I'll ony bash Rockstar Games if this decision isn't well implemented, cause the way I see it, this is not a bad decision at all.
And just like Batman, I feel Sammy Lake is the best Payne model, an icon I'd say. And that said, there's no reason to not get different actors to do the role. Of course, if he was back as Payne and the writer, it would be an awwesome choice.
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How awesome is, too, that Payne is using hawaiian shirts, like Sam in the very first MP, in this come back

?