I've heard about the "boring man" voice in some of the EPGY courses and hope that the OHS isn't the same.
The old man who narrates most of the EPGY math and language arts courses is Professor emeritus Patrick Suppes, who has been working on computerized instruction since the 1960s
http://suppes-corpus.stanford.edu/browse.html?c=comped&d=1960 . You can listen to one of the videos at
http://suppes-corpus.stanford.edu/lectures.html and tell that is the same voice as on EPGY. I like the fact that he has been personally involved in creating the course.
My three children use EPGY and like it.