The other thing in their favour; they are completely legal. No licence to be checked, no nothing. That's tasers rather than shock ammo mind, but it is a big thing - and personally, it made little sense, so I made them restricted in game.
The advantages of shock weapons in close combat is you can dumpstat strength, and the advantage of shock weapons in ranged combat is you can pick a small, easily concealable pistol and just rock the casbah. I'm ignoring the whole lethality and theme thing at the moment, because different people's tables have different expectations, but the mechanical advantages of a decent damage output for very little will always remain. Unless house ruled.
Which you can do. If you don't like them, then there's a number of changes out there; ban SnS, rule it gains not DV benefits for burst fire, and so on. I know I did.