They're still viable if the person can get caught by them. Two nicks from a weapon and they'd die. They just need to revert the arming time and itll be good. Now once RoI comes out, all of the SS grenades will be useless since the artifact is gonna reduce DoT drastically. Its better to use solar grenades with subreakers with vf and touch of flame. Get good at your grenade placement and they're best.