Many gamers just accept silent protagonists without doubts. But game developers often have good reasons for using silent player characters -- perhaps to help players immerse themselves in the game,or because of the lack of technology, or because too much recording would needed, etc. And gamers know that. We accept it.
That is why some actually silent characters becomes special. The real quietness gives some extra characteristics to the characters that are unlike other protagonists.
I believe that there are more actually silent characters out in the world of gaming. When you are playing some game with a protagonist that doesn't talk, it can be pretty fun to think about whether the character is just a seemingly silent character, or a character who is truly man/woman of few words!