I'm sure it's been mentioned a million times at this point but ballistas need some serious attention. They're either entirely useless for their team, only used against their own team, or in some cases they're practically invincible.
I just played a Mountain Peak level where red ballista went 41/0/0. They were able to shoot INTO BLUES STARTING SPAWN.
Nobody could touch them, because that area is inaccessible to blue. The only way to get close enough for a fire bomb is by running up a ramp, directly in the ballista's line of fire. Who thought that was a good idea??? There should not be a spot where someone can rack up dozens of kills uncontested without any danger of being attacked.
Also please fix horses, they can still stagger you out of your parry and immediately kill you. An experienced horse rider can use this to get free kills, even against someone who sees the attack coming.