In all fairness to the OP, I think North Americans don't really hear this accent that much. So the first thing they do is associate it with what they're familiar with. Most of us are very familiar with the govenator...so yeah, I can see why you'd say it sounds like Arnold.
I'm sure, Bethesda being a western game developer, had this in mind when casting. After all, Conan plays a large influence in terms of art direction for this title.
Very true.
I can honestly say I have never heard anyone else that talks like him ever in my entire life,so the first thing that came to mind was Arnold. The only thing close is maybe some Viking movies I've seen with the typical "Helga" character,but other then that,I haven't heard people with his accent anywhere else.
Maybe I needa go watch more movies.