The force is still mystical. The midichlorians just explains why some can use the force better then others and why droids can't use the force. It also made Anakin a virgin birth. He was concieved by the midichlorians. This gives Anakin as more of a Christ like figure. He was born of virgin mother, birth was prophsised long before he was born, he is tempted by the dark side (devil), he begins off with special powers and without sin, he dies to save everyone. Oviously Jesus never went nuts before saving everyone but there are definute similaritys.