From the predator’s point of view, the number one thing that needs fixing is parrying. It’s absurdly overpowered, to the point where going in is no longer viable, even against a single fireteam member. This limits your options as the predator and makes most matches play out at long range, which is boring for both sides.
If the parry can’t be altered to be less spamable, maybe the pred needs a perk to deal with it, or one of the melee weapons could be changed so that the likelihood of parrying it was less reliable.