Like most others who have read Chesterton, I find him enjoyable, hilarious, and utterly commonsensical. Orthodoxy is the perfect introduction to the man and his writings.
(...)The orthodoxy Chesterton speaks of is not the Eastern Christianity but traditional Christian doctrine from even before there was a division in the Church. It is akin to Lewis's Mere Christianity in that it is not in any particular denomination but mainly to be found in the early creeds of the Church which the vast majority of Christians acknowledge as authoritative (e.g., Apostles', Nicene).
In response to those who dismiss Chesterton's views as "unscientific" or "outdated," I answer, as Chesterton might, that a strictly empirical method of acknowledging reality is not defensible on strictly empirical grounds, and to assert such is thoroughly narrow-minded and dogmatic, or something to that effect. Chesterton's treatement of foreign peoples may often be characterized by ill-informed or distorted views, but I cannot recall any malice towards them. In our society so eager to be offended, many often overlook the truths within satire, or satirical writing. As for his views just being an excuse to be contrary, if anything he was seeking to be the same, similar to two thousand years of Christianity. As he famously writes "Tradition is the democracy of the dead."
Finally, I believe that any unprejudiced person, while perhaps not agreeing completely, would find it difficult to deny out-of-hand Chesteron's characterizations of man, man's sinful nature, and his wonder at the universe. And at the very least, his style is engaging and Orthodoxy is certainly great reading.