I thought it was exceptional.
One of the aespects of Mother that i liked compared to other depictions of AI is that her goal wasn't to eliminate humanity, it was to save it. True, a machine's concept of how to "fix" humanity may not line up with what we think is right, but that's sort of the point; Mother looks at the Big Picture, and she raises Daughter to do the same. Her entire intended purpose was to raise Daughter to instinctively choose to protect her brother at the expense of everyone else--including Mother. The fact that Daughter ultimately chose this satisfies Mother, as she has finally succeeded in raising a version of Daughter who has Mother's own philosophy embedded within her.
On some level, that is what ALL mothers do.