I bought this game for my son because it is not too violent. My son is 13 and wanted to get Overwatch. My son has seen countless pg-13 and some R rated movies. This game seems very mild as far as first person shooter games go. He is responsible, and I am completely fine with my son playing Overwatch.
I am not a fan of first person shooter games, or video games in general. When my son first asked me for this game I was skeptical. I researched overwatch online and found that it didn't look terribly violent. My son has seen many pg-13 movies, some of which were more inappropriate than this game. I'm not very happy with him playing overwatch, but I allowed him to buy it. As far as first person shooters go this is not bad. And I am comfortable with him playing it.