Originally Posted by
Valyrian the Moofia Boss
There are many, many ways to counter Bastion:
Genji, Bastion's archnemesis: just shift into Bastion's line of fight, press E and and aim back at Bastion. If the Bastion isn't reflexive and stops firing within half a second, he dies. Boom, that simple.
Junkrat can bomb Bastion to death before Bastion can get out of turret mode and flee without any risk to himself.
Pharah, like Junkrat can bomb Bastion with little risk to her self; she can just use the AoE power of her rockets to hit him from around corners without actually entering line of sight.
Mei can just sneak up on bastion and freeze him to death while jumping over Bastion erratically.
Roadhog can just hook Bastion, stopping his gattling gun channel and stunning the bot, and kill him just like that.
McCree just needs to sneak up and press E, instant win.
And of course, there's just plain old getting the drop on Bastion and killing him before he can react. Seriously; he's not a god people.