I really liked the Hamlet in this series, but I found Crystal's take on Midsummer Night's Dream pretty sloppy. For example, he claims Hermia is named for "Hermes, the Greek goddess of dreams." Some of the ways he defines terms in the margins are similarly off. A lot of material in the "Before" section is recycled from other books in the series. So my overall impression was that the book was put together in a bit of a rush. However, I'm willing to admit that finding less insightful analysis here might also be because Midsummer has much less meat than Hamlet.
However, Crystal does still do nice things with rhyme and meter, dutifully taking note of when characters use blank verse, rhyming couplets, pentameter, tetrameter or trimeter. He notes when characters switch between you and thou. He also pays close attention to the different possibilities for acting and staging key moments, which is something that holds him apart from a lot of the other writing on the play.
Don't turn to this book for solid literary analysis or a good background on Shakespeare or his time. Rather, look at this as a book that models a process of meaning making that you should develop with further study and research.