This is exactly the type of book that could prove useless to some and gold to others. Like most of the other case book studies series, this provides additional ideas and critical material that you might not otherwise have been supplied with. However, the Wuthering Heights edition of the series takes this further; the criticisms are shorter, more wide ranging (quite marginal ideas); though just by looking at the contents it aptly reflects the diversity (or at least percieved diversity in the minds of the critics) of the novel. From Marxists to Feminists, everyone has something to say about this book.
The student that hasn't yet got to grips with the text, to be honest, is probably better off sticking with a basic guide, i'd recommend the 'Analysing Texts' series "Emily Bronte: Wuthering Heights" by Nicholas Marsh. But only if you think you've covered the basics on voice etc. and the more popular thoughts, should you scan this. No matter how close to the exam you are, a quick scan of this will supply you with enough ideas to pad out any flailing exam essay. Scanning really is the only way to read this book, you may well find yourself lost in an argument hich has nothing to do with the novel at all, but it is these digressions which provide you with knowledge of context and genre...if you can recognise that, then i'd recommend this book to you.