I haven't purchased that book yet. I do think that one reason some protestants are drawn to the orthodox is their Liturgy, but, far more importantly, their animus to Rome and the Pope. Many prots were raised to think that Rome and the Pope are evil and they find they are welcomed with open arms in the orthodox church. They also get to live in a communion that is quite flexible abouit Doctrine. They can contracept, divorce and reject authority while keeping the smells and bells - it is prolly seen as an enormous blessing for many.
Fortunately, most protestants that convert, convert to the true Faith and do not spend their energies attacking the orthodox or other protestants. By their actions you shall know them.
For every Frankie Shaffer who cultivates a nasty antiRoman and antiPapal personna and publicly attacks Rome, there are scores and scores of Scott Hahn's who never speak ill of other Confessions.