The vanguard is op with the invincibility shield. A vanguard will be able to kill a single lightning before his shield turns off. He will be able to damage a magrider before his shield turns off, then take a bit of damage while finishing him off, because of his higher armour and firepower. I think the shield should either be removed all together, or the vanguard gets a serious nerf. Perhaps the vanguard will takes 5 seconds to deploy the shield after the button is pressed, and in those 5 seconds, the damage taken to him is equal to the damage taken in the rear on all sides. Or, he takes less damage while the shield is deployed, but is not invincible. If we go this path though, his armour should be reduced, as he would still be over powered. And lock ons need a nerf too. I think they should not be 100% accurate. If the target is far away, they have a chance of loosing the lockon and flying randomly into the ground.