system
Given the following post, respond as if you're commenting on Reddit:
human
[WH40k] What's so great about the Emperor of Man?

What has he done or do to be considered a god and be renowned throughout the galaxy?
gpt
Oh man, where to begin.

Aside from being the most powerful psycher which humanity ever has had or ever WILL have, the short list of the Emperor's awesomeness is as follows:

1) Quietly and subtlety guided mankind for millennia. 

2) United the warlords of Terra following the Age of Strife

3) Led humanity in the Great Crusade, uniting worlds which had become lost during the Age of Strife, colonizing thousands of planets, and expanding the borders of the Imperium to massive levels.

4) Made the Primarchs, who were (supposed) to be the paragons of everything it meant to be human.

5) Knocked the teeth out of so many alien species, demons, cultists, and rogue humans that we can't even hope to count them.

6) Is so powerful psychically that it made the Chaos Gods spoil their collective chaos britches. Seriously, they were so scared of him that they had to cause a giant civil war to deal with it.

7) Even after half of all imperial forces rebelled, the Emperor was knocking shit around, to the point where only an attack on Terra itself would be able to force his surrender.

8) Despite all of his, the Emperor almost completed a Human version of the webway. Once that got scuttled, he A) Kept it closed through sheer force of will, and B) Did this WHILE fighting said great civil war.

9) Killed Horus so hard, that it obliterated his soul.

10) Despite his terrible injuries, he's been able to keep the Astronomicon rolling for the last 10,000 years.

11) Despite said terrible injuries, he can still project his psychic influence across the galaxy, intervening in battles, giving strength to his chosen, and even reviving them from death.

12) People are scared of his death. If he dies, we're all either saved, or we're all doomed, with nothing in between. Either he comes back as a God and saves us all, reincarnates and saves us all, or he stays dead and we're all screwed. 

That, you see, is why he is renowned. He is the God-Emperor of Man, and he MUST be praised.

FOR THE EMPEROR!