From Destinypedia, the Destiny wiki
Zen Meteor is a fairly well balanced sniper rifle. The intrinsic perk turns each round into an explosive round. Combined with the high impact most sniper rifles guarantee, most enemies close to the level of the weapon will fall in two body shots, and enemies nearby will take damage if close enough. This enables you to scatter and weaken enemies clustered together.
The use of the Exotic Perk demands that users of this weapon be able to kill enemies in rapid succession. Unless in an activity where the enemies are significantly weaker than you, three rapid head-shots on three standard enemies is the best way to go. Because the magazine only holds three rounds, missing one shot or failing to kill an enemy in one shot bars the use of the perk, so good aim is a requirement. Fitted Stock is good if you need help keeping the gun steady while aiming. Injection Mold is better if you need help aiming faster to get the perk to activate. The extra round appears as a buff that only lasts for five seconds, so you have to move fast to take advantage of it. Even though most of the barrel upgrades reduce range, the Underdog perk can compensate.
Because of the nature of the Exotic Perk, this weapon is as good as any other sniper rifle against bosses. However, in Raids, enemies usually spawn in the same places each wave. With good speed and aim, the perk can be used to pick off enemies as they appear and get the extra round. However, because of the fact that you will be operating with a Fireteam, allies may kill enemies before you can, making it harder to take advantage of the perk.
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