I have not yet read much MacIntyre. In fact... I almost wrote him off because a close friend was attempting to tell me that MacIntyre claims that nothing is self evident, or that there are not first principles. I think my friend might be been mistaken.
I see that Feser references MacIntryre on occasion, so I looked into MacIntryre a bit more, and found a paper he wrote on first principals. He noted that when speaking to modern philosophers, the language used in a Aristotelian Thomistic way... is bound to be misunderstood. I do not see this to mean that he denies first principals.
It will be awhile (I feel the need to study a bit more prior to cracking one of his books), but I plan to start with these:http://amzn.com/074254429Xhttp://amzn.com/0268035040