Sneak attacks..... right
Whenever you fire those things it's "PHEW PHEW PHEW PHEW PHEW PHEW", I don't call that silent. Maybe if your playing against someone who's in first-person you might get an advantage, and hump him in the back with 6 little blasts. There's no such thing as a sneak attack. You might take goku, charge a huge kamehameha and tele around the map to shoot someone in the face, that's sneaking.
Makes too much noise, wtf? Whenever your doing a KHH or BBA you scream like your dieing, and yet they're mostly used to kill people. That attack might cause a little noise, but it's not like that makes it useless. Otherwise I'd count BBA, KHH, GG, etc out.