It really didn't feel that ambiguous to me, with your entire party screaming at you that it's a tadpole trick and the Guardian refusing to give you any answers.
Granted, EA was WAY more obviously evil. Like mustache twirling levels of evil. The Guardian is just the normal amount of obviously evil.
But the Guardian isn't exactly evil though, is it? The initial resistance from your companions ends up being unjustified and inconsequential. The Guardian already tells you everything you need to know about the tadpole and mindflayers in the second dream. The only reason the Guardian is perceived as evil or viewed with suspicion to begin with is because people go into the story with expectations they have from the early access.
