Swearing adds to the atmosphere. In this particular game, it fits very well.
I really don't think an old bearded guy in the sky who allows mass murder and child deformities to occur, is really bothered by what a video game consists of.
I'm sure Thor is pissed about there not being a hammer in the game.
Quite the contrary. The 'big man in the sky' is hurt by every injustice that we let happen. He doesn't allow it to happen, we do it anyway because he gave us free will. So either we do what he intended for our free will - worship him and try to live flawless lives or we choose to ignore him and do our own thing. Its the latter that makes the world such a gnarled up place.
-However-
I know and accept that there these sorts of things going on, and when I hand over my money to take part in the zombie apocolypse I can accept there's either going to be swearing from the characters or the people playing it, its pretty much inevitable. To a lesser extent I expected it from HL2 and it was far less noticable in HL2 even though it wasn't out of place I mean its a pretty torn up world those guys are living in, I'd be pretty suprised if they were all talking about sunshine and rainbows (except about how much the miss them..)
I didn't expect it from TF2 however and was quite shocked to find there to be several instances (most notably the sniper's taunts and the meet the scout video) of swearing. However its got a suitable rating and thats fine, as long as you know theres going to be questionable material in it before you buy you can take the choice to subject yourself to it.
To the point of discussion - It doesn't 'enhance' the gaming experience to have these choice phrases audable but they don't stick out as being added for the sake of it. I've played games, particularly some of the more modern ones where they just seem to have layered on the swearwords as heavily as the blood effects, and they just don't feel right, so in those cases they do detract from the experience.
Taking a stand about not buying more valve games because of this is pretty silly, take a look at the current games market, of all the shooter games you're going to get swearing and cursing in all of them, whoever makes them. So your only choice really is to not play such 'violent' games and find some other less potentially offensive hobby.
To end with: lol@ Thor being pissed due to the lack of hammers :lol: