01-18-2013, 09:11 PM
Because it isn't. Shellshocker can hit different sets of 5 enemies every .3s, can proc signet effects multiple times, and isn't wasted if your targets just happen to die inside the AOE, if there's more than 5 targets.
If you're just straight-up comparing a slow on only one set of enemies, then yes. Shellshocker is worse. That's why you don't pick shell shocker if there are only 5 beefy enemies instead of multiple rush waves.