Demonic,
But yes, Dragon Age: Origins is called a "dark fantasy" for a reason by the developers
Yeah, they don't know what 'Dark Fantasy' means!
In Dark Fantasy, there are no good people at all, only varying degrees of bad, and everyone is out for themselves. It's a vastly more brutal genre than DA:O is. If you can find the old
Theives World novels, they are Dark Fantasy...
***
As for the rest - I never said the group you recruit are bad people. Broken, scarred and damaged, yes, but not 'Evil'.
Morrigan is the way she is because her Mother raised her in isolation like that and she has no idea how else to be. That's not 'Evil' because she has made no concious choice. Leliana has a vastly darker background than Morrigan does, and most of that was by her choice. Her old self could easily be described as 'Evil', but she's fled from it and is attempting to become a new person. Sten has his own codes of honour that are those of his own people. Alistair is a completely hapless moron, Oghren is a drunken wreck, and Zevran is a bit of a Morrigan in that he was thrown into his career with no choice. Wynne, for all her good advice, is more neutral than outright good. You might say Zevran is evil, or that he's a survivor. You could say Leliana was. The rest - no.
As for the Archdemon being 'Evil' - are you sure? Do you ever get the slightest idea of what the thing actually wants or why it does what it does? It and the Darkspawn are inimical to the Dwarves, Elves & Humans, but, as the Architect proved in Awakening it doesn't always have to be that way...
Oh, I'll agree the Sloth Demon and the like are 'Evil', but they are a minor sidebar, not part of the main opposition. They aren't allied to the Archdemon or to anyone but themselves.
