Hmm Narcissa was certainly an elitist, but then again she was brought up to believe those things and we never really are told why mudbloods are looked down upon but for all we know there could be a very good reason for it, well good reason to the purebloods at least.

However we do see that she cares greatly for her family, she is extremely protective of Draco and the first thing she asked Harry in DH was if her son was okay. This shows me that she is a loving person to those that are close to her, and that she is indifferent to those that have done nothing to impress her, I think that she like Lucius was a good parent. Yes I think that Lucius was a good parent.