lesser multple projectiles

If lesser multiple projectiles reduces your damage, then what makes it so great?

2 more projectiles, no?

Let us presume you face pack of mobs with single target skill to kill them.
You hit first mob with 100% of your damage so many times as its life / damage, then second, then third. With LMP added lets us presume 1 lvl of a gem you will hit 3 mobs at once with 30% damage reduction. 3 * 0.7 = 210% damage output per shot. Twice damage per +50% mana cost.

GPM is an upgraded version that allow you to hit 5 targets at once at 50% damage for 200% mana cost, making damage output 250% per shot for +100% mana cost.

All those additional projectiles could be chained via chain for more damage output and more mana cost.

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morenalan wrote:

If lesser multiple projectiles reduces your damage, then what makes it so great?

Crowd-control. That's why players will always have a reliable AoE-type skill on hand, whether it be the skill having inherent AoE or augmented by Lesser/Greater Multiple Projectiles/Fork/Chain.