The choices, preferences, experiences, and particular strengths and weaknesses of a given book's creators will unavoidably shape its presentation of the Latin language. Any and every introductory text will have a bias of some sort or other.
Latin Via Ovid: a Message from Exile
So, in the end, the big question is this: do the strengths of the exclusive focus on Ovid outweigh the drawbacks? On the whole, I think they do . . . with conditions.