The competitors here are not weak, they just face harsh realities sometimes.
Samson was incredibly strong and, with the addition of special armor plates, became terrifyingly durable. Its powerful drive system allowed it to wield even mightier weapons, some of which were typically reserved for use with power armor.
But without their vehicles, faced with the terrifically lethal high-explosive armor-piercing bullets, they were just larger targets.
Alpha was well-balanced with strong compatibility—just equip an experienced mercenary with special enhancements, and she could hunt down a gang leader in the city like a super assassin.
However, a slightly wider-reaching, more powerful explosive could limit her movement. Add a sharpshooter with a technical rifle, and it would be enough to penetrate her body.
But things were different for Lille—