The Gangstalisk would probably be a horrible unit in close combat, but would be pretty awesome for ranged and ground-to-air, as its activated ability to play awful music with incredibly strong bass would kill any other units in a large area, and quickly take anything in that same area out of the sky. Of course, it would kill its own units as well with this ability, so it would need to be activated far, far away from the player's base, and probably be sent in alone (or maybe with a few Zerglings for protection). Of course, it could also be easily defeated with a Battlecruiser with a Yamato Gun...or maybe a Siege Tank in siege mode...oh, and other Gangstalisks would be immune to the ability, but multiple Gangstalisks close enough to each other would start shooting each other with pistols (slightly modified so that they could use them, of course), regardless of who is controlling them.