As a 14 year old that plays this game often, I would have to say that this is a game where you need to pause and know your child if he/ she is 13 or under. It does, in fact, have quite a bit of language, and almost constantly says F, S, both B's, and a few D's, but the in-game language can be muted or turned to French or other various languages. I, myself, do not play the single player, because it IS a bit past the violence meter for me, but the multiplayer, if you turn off the in-game speech, is more of a T-rated game. The violence is nothing worse than Uncharted, another T-rated game, or the Batman: Arkham games. When you shoot at someone, if you manage to hit, it is very quick and has no blood, unless they are lying down or against a wall, in which a small puddle can be seen. You can use a mic, but it is optional (I would recommend it, seeing as most of the other people who play it use little to no language). If the case happens where there is someone using foul language, you can easily mute the TV, because the objective information is displayed easily and obviously on the screen.
Overall, it's a great game, and I would recommend it for ages 14+.