I'm a bit torn on how to review Grace. As a drama, it does have fairly decent suspense and a slow burn kind of pacing. If you have a short attention span or enjoy gore, this will not be a worthwhile experience. As far as horror goes, it falls short of being frightening, though I do not think that was the plan. The disappointment in the reviews seem to come from expectations rather than the actual movie. At no point was I bored. In fact, it was a pleasant diversion to become immersed in the characters and the mother's slow decent into brutality in order to save her child.
"Grace" is generally presented as a believable story in its context, and is well acted for the most part. A mother desperate for a baby, and destined for a stillborn child, miraculously has the child survive, only to find eventually that blood is the only thing that keeps it alive. The plot is fairly creative and there is tension throughout the movie. Still, if Lifetime had a horror network, this would be its centerpiece."Grace" is certainly worth a watch if you adjust your expectations to include suspense rather than horror, and subtle terrors rather than blood.