Mei is one of the more unique defensive heroes. She can do damage on her own, but most of her play is about slowing down the enemy charge. Mei can be really annoying to an opposing team if well-played, keeping enemies from using their best skills.
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Mei Move List
Primary: Endothermic Blaster
Mei's primary weapon shoot a constant stream of cold within a short range. If you keep this stream on an enemy, not only does it damage them, it also freezes them in their tracks. This is the time to hit them with Mei's secondary fire, a medium range icicle that does solid damage up close. Aim for a headshot with the icicle and you have a dangerous combo. Clip Size: 200.
Cryo-Freeze is Mei's self heal and personal defensive tool. Mei will encase herself in a block of ice, becoming completely invulnerable and healing 150 HP in 4 seconds. Cryo-Freeze clears debuffs and can protect you from any attack. It also keeps you in range of an objective, so if you see hell coming, Cryo-Freeze. You'll be an easy target once you unfreeze, but using it with the right timing can save your life.
Mei creates huge wall of ice that blocks line of sight, closes chokepoints, and soaks up damage. The Wall itself is made of five adjacent pillars with 500 HP each. They can be destroyed before the 4 seconds duration of the ability is up, but in the meantime, your enemies are generally locked on the other side.
You can use Ice Wall to control the flow of enemies through a choke point, blunting a push before it has a chance to happen. You can block turrets, lock enemies in rooms, and prevent snipers from having a clear line of sight.
The Ice Wall can even be used to push allies higher if you built the wall underneath them. YUou can use an Ice Wall to get a Bastion player to places they normally couldn't go for a great surprise attack. This is probably Mei's most versatile move. Learn it.
Mei drops a drone that freezes and damages all enemies within a certain area over the course of 5 seconds. It a great move to drop on control points to bring the opposing side to a standstill. Oddly enough, Blizzard can be Deflected by Genji or absorbed by D.Va's Defense Matrix.
How to Play Mei
Mei is about stalling the enemy team. She can slow them down with her primary fire and her secondary fire can do good damage if you have great aim. Cryo-Freeze protects and heals her from damage if she gets in a hot situation and Ice Wall simply tells the opposing team "keep out!" Blizzard covers most of a control point, giving your team a chance to clean up.
Who Mei Plays Well Against
Genji: Mei's Endothermic Blaster goes through Genji's Deflect and will freeze the highly-mobile ninja in place. Use this to your advantage.
Reinhardt: Run straight through Reinhardt's shield and freeze him from behind to make the tank and easy target for your team.
Winston: Like Reinhardt, a Mei blitz means a stationary tank. Winston's weapons are all close range, which puts him in freeze range where Mei is king. Combined with Ice Wall and Cryo-Freeze and Mei can effectively keep Winston locked down.
D.Va: Defense Matrix does not absorb Mei's Endothermic Blaster and D.Va's Fusion Cannons do the most damage at close range, which is Meitown.
Bastion: Dropping an Ice Wall in front of Bastion gives your team a reprieve from Sentry mode. Use it well.
Who to Watch Out For While You're Playing as Mei
Reaper: Mei's primary takes time to freeze an enemy and Reaper's Shotguns are likely to kill her before that can become a real problem. Wraith Form also allows Reaper a reprieve from being frozen.
Widowmaker: One headshot kills Mei and Widowmaker is usually far outside of her effective range.
Pharah: Likewise, Pharah's flight capabilities means she's usually not within Mei's range and can easily soar over any freestanding Ice Walls.
Mei can work extremely effectively against quite a few opponents in Overwatch, but as with any other hero in the game, the trick is knowing what heroes she doesn't play well against.