Scatter grenade has been terrible since D2's launch. The only time you will ever get a kill with it or even half hit with it is when you charge it with top tree voidwalker and it tracks, but even then your opponent would have to sit in the grenade for it to do any real damage. Despite it looking cool as heck I really miss the grenade being viable in PVP since comboing it with the nothing manacles from D1 was always really fun. I think one of the major factors that has led to the downfall of this grenade since D1 is the addition of better movement abilities and an overall increase of speed of everything D2 has compared to D1 and these movement abilities have left the scatter grenade in the dust. I recommend bringing nothing manacles back and just increase their damage a bit.