I think he's brilliant, what say you?
http://en.wikipedia.org/wiki/Alasdair_MacIntyre#After_Virtue_.281981.29
I only read up on him briefly, but compared to the other major Catholic approach to morality (Aquinas), I think his is better.
The ideas of virtues better explain what is good about good without divorcing it from social context, rather than pure argument from authority, such as good is what god wants or natural law.