I do enjoy the "adults" that complain about this and their kids seeing the emblems. While I understand this logic, please tell me why you are playing a Mature game in front of your kids that is about killing other people? I get that it is virtual, however maybe you should reconsider your parenting.
While some emblems are childish, some are still funny and if you dont like just dont look. Hell, dont even play the game. Its easy to stop. Report if you must. Press the power button. You are in a soceity that puts on TV "Teen Mom" and other nonsense that is much more harmful than this game. People need to learn to chill out. IF you dont like the emblem report and be done with it. You people crack me up some times.
While the majority of them is from kids or teens, I bet a good number of them are also from people in their 30s and even 40s...which is sad. Same goes for racial emblems, or just anything derogatory. It doesn't exactly bother me to the point of disgust, but I will report them as its not needed. While its cool, you also have to blame them for including the feature as they had the same problems in BLOPS 1.
Treyarch should just make an option to turn it off for viewing. If someone has kids present, then turn it off, and you won't see anyones emblem. If you don't mind then turn it to on + report the bad ones.
Like someone said earlier - you can turn blood/gore off in the options.
There is an option to turn it off on Xbox Live.
Sad thing is it turns all the players off too.