Simple poetry, surprisingly simple, when you find out that, yes, short, rhyming verses are enough to convey the narrative, comprehending character building, some imagination and theological/prophetical clarity alongside the Bible's storyline for the book of Ruth. Ah, and humor.
The flaws in metrics made me not give it five stars but, trust me, the whole thing makes this shortcoming pretty irrelevant.
This is totally worth the time you're going to take, albeit it's going to be short. And the drawings might be a plus. I think the best ones are those when David, Obed and Boaz are together. I did not quite like the other the drawings, but they're not "not okay".
Enjoy it. It's a Piper thing, after all :P
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PS: It's not like I went for this book with any "John Milton" kind of expectations, not in the slightest. Otherwise, it wouldn't have worked for me... So, be warned. I love highbrow, but this is not it.