Here's a nice little opinion piece written by the author Mohammed over at Frag Crunch, titled "A Look at Swearing in Video Games". I've expressed my dismay on more than one occasion here about a game's use of excessive language ruining the experience (or interest) for me. It's always nice to get a second opinion.
I'm not sure I'd go as far as he did in his conclusion, though, that the excess of a few examples necessarily negates a whole medium's status as art. I would suggest that Hollywood has put out quite a few movies that take things to excess with little value (language, gratuitous sex, violence, meaningless special effects); but just because Michael Bay puts out a few movies that are all explosions and no plot, I wouldn't say movies aren't an art form in the general sense. The value of certain, particular works of art in the medium can be debated, but I'd still say it's a form of expression.