Magnetic Grenade only one hit kills if it sticks to a target. If it doesn't, you can literally stand on the detonation spot at full health and you won't die from the two explosions. Titans have the most tactical grenades, but in terms of overall damage, they're pretty weak. Pulse Grenade is good for choke points and area denial, Lightning and Spike Grenade only work if people are dumb and your aim is flawless, then they work like Pulse Grenade. Suppressor Grenade is weak, but it can be really annoying if you hit someone with it that would use their super or melee in time. Flashbang is also weak, but the blind is great.

well I'm a full time warlock and warlock nade doesnt do shit unless you use sun singer and stick the enemy with one, or if the enemy is stupid and stands in the solar flare. Titans flashbang is actually useful for control, magnetic nade is awesome cuz people think they survived when it blows up the first time and they come out of their hide out and boom, they start backflips when it explodes the second time.