User blog comment:James12708/Reapers VS. Forerunners VS. Angels from Darksiders VS. Humanity from Halo VS. Council and humanity from Mass Effect VS. Imperium of Man/@comment-5436239-20130130074424/@comment-68.8.14.28-20130131021359

In my opinion, here's how it goes:

Forerunners > Imperium >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Reapers >>>>>>>>>>> UNSC.

What the hell is making you think the UNSC would be second? They're by far the weakest on that list; the salarians could effortlessly defeat them, to say nothing of the Imperium.