She is. Very much so. She is too certain. She acts without doubt. And in my opinion no one has a reason to be arrogant. It is a fatal flaw. Thor said he reminded her a lot of how he had been once before Odin banished him and I agree. She is a lot like it. It is what makes her dangerous most of all.
But it doesn't mean we'd lose either. Everyone has weaknesses. She has plenty. As do I. As does Father. Every single one of us has weaknesses. Her arrogance and self-assuredness is only one of them.
But can they be trusted? Hope is often in it for herself. Not that I mind.