I would recommend Apostolic Fathers in English to anyone wanting to learn the roots of our Christian Faith, from the earliest century of Christianity. The introductory material is a little excessive, but the access to early letters and sermons from men who knew and were trained by the Apostles of Christ is a real treasure. Many of these same men had also experienced contact with Christ Himself, and were also eye-witnesses to His life, teachings, miracles, death and Resurrection, adding their accounts to the record of the Apostles themselves. I have just begun to read, sequentially, through the Fathers actual writings, and enjoy the sense of contact with the first Christians I find there. I didn't need to have my faith validated, but these letters and sermons do validate my faith all the same.
I would suggest to any reader to use the Table of Contents and go directly to "the horse's mouth" reading just the actual writings of the Apostolic Fathers. Leave all the introductory material until last so that any undue influence may be avoided in the reader's response to the Fathers' writing. The reader will come away feeling a sense of having touched the past, and found a link to the present. It's a challenging and comforting read.