I've been reading the Ante-Nicene fathers lately. I bought them back when I wanted to research between orthodox and catholic but never got into serious reading til now.
The editors of the series were Anglican so they often throw in snide comments against "Romanism" - I mostly ignore them.
So far I've found the writings greatest value to be in learning how early Christians read and understood the Bible. Justin Martyr's "Dialogue with Trypho" contrasts how Jews and Christians read the Bible, and Irenaeus in his book "Against Heresies" first exposes Gnosticism and then in books 3,4, and 5 lays down the Church's teaching. He also writes that the true interpretation is to be found only in the Church, by studying with the presbyters.
Right now I'm on Theolphilus of Antioch and he writes a very interesting explanation of Genesis. Theolphilus takes the genealogy from Adam as history, but puts symbolic interpretations on the events of each creation day. There's ten volumes in total so much further to go.