As far as the question he had in his first post:
Language in a serious game or movie is necessary whether you feel swearing is wrong or right. To convey the proper emotions and to be believable it has to emulate what would happen in certain real life situations. Now, I've not played prototype so I can't say if it's overboard on the swears, but yes, when games, music, movies, etc. go overboard I just find it annoying. It's like the writer's aren't creative enough to give their characters any intelligence.
Yeah, lots of people would swear up a storm in these situations but I feel that when it comes to a piece of art like a game or movie when they do an extremely cinematic, flawless combat sequence, does that happen in real life? Rarely, if ever. These sequences can beautify the final product, just like giving a character a more mature and intelligent dialogue than one might have if he were really placed in that situation.
But yeah, when people in real life as well as in games and movies swear all too much. It takes away the implied seriousness of the words if you ask me.