Is Call of Duty Black Ops suitable for my sons?

well unless your kids have seen violent movies with blood and gore and inations then I think it will not have an effect on them usually the inations are only through the story mode but online is where all the killing takes place plus not to mention how much people tend to curse online and no the blood and gore will still be there online heck even in the Nazi zombies level you can see all the gory features when you shoot a zombie in the chest,head(decapitates them) etc...