According to ESRB, this game contains: Blood, Violence
Parents will notice that Gungrave: Overdose sports a mature rating. It is a violent game that involves shooting literally everything on the screen—however, since there are no real characters in the game (everyone's the equivalent of a cardboard cutout in a shooting gallery) the violence doesn't really ever tie into the real world. The real reason you should keep little Timmy away from this game is because it's not fun.
Fans of the original can safely skip this one—it's the same thing with twice as much repetition. Adding two characters and a few new demolition shots may seem like advancements, but when the core gameplay is so simplistic and repetitive, you're going to have to do something a lot more profound than that to make the game seem worthwhile. Stick with the original.
Casual gamers will no doubt be lured in by the $15 price poin, and most of them will come to regret it. Cheap games are nice—at least when they're games worth playing.
Deaf and Hard of Hearing gamers can experience all the game's brilliant dialogue as it comes subtitled.