Tripmine right now is not very effective in PvE. The problem is when it's tossed at an enemy it bounces and then spins. During this time it would detonate while spinning. Here's the problem, detonation area affect is random. Sometimes it will not damage the enemy in proximity to the beacon cone.
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I refuse to use it in pve since the update, agreed it is garbage now. I've had cabal nearly step on it without it blowing up, placed on a wall it still barely does anything. Pretty much stuck using 1 grenade in pve for gunslinger because in all honesty I find the swarm grenades just as ineffective as before. Rather annoyed at this point.