These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
That One Boss: Prometheus at the end of the human campaign. IT gets a custom and stupidly overpowered mech that has a random weaponset, which can easily be the overpowered alien tech. Winning is almost luck.