One word. Helspawn.
It's pretty simple, to be honest.
Think of any game where you design your own character and play through it using it. Probably almost all of those games will have the same goal of being the hero, the top guy, the world icon, the main event world champ, all that jazz.
And that's the case because it's fun. It's good to get some wild accomplishment against some proper opposition. Some recent games decided to subvert it somewhat by fucking over your character every now and then, look them up and you'll find people aren't very pleased over that because it's stuff they really can't do anything about.
CoC2 is essentially looking at that vitriol and going "...hm, can you add a horse dick to that?". Hence why it's so easy to dislike the OCs in this, they're the perfect vehicle to generate vitriol and, even worse, apathy.
The sort of apathy that lead people to look at this and go "Oh, fuck this", delete the game and never look back.