Ghost Squad? Granted, it's got "gun violence," but the game is safe enough for kids to play at the local arcade/minigolf anyway.
Its somewhat enjoyable and I could see kids having a blast with it. Its hard to find a game my nephew can point and shoot things with, for that reason alone it may be worth a pick up.
But yeah, Nerf N-Strike is essentially Ghost Squad/Virtua Cop/House of the Dead for the younger set. Having a combination lightgun shell/Nerf gun is just a bonus.