Venturino's text (you'll get the joke, soon enough!) is an excellent introduction to Literary Theory & Criticism for those just beginning their foray (I'm thinking especially of new graduate students or, possibly, advanced undergraduates). It's also a great reference for those who are already familiar with literary theory/criticism but who may need reminders, refreshers, or help with connections of various types (across schools, historical relationships, etc).
That being said, this is probably not the place to go if you're completely unfamiliar with literary theory & criticism... perhaps the "Very Short Introduction" (Culler) or a MOOC (or, better yet, an actual course!) would be more appropriate. Still, if you're preparing to know, or beginning to know, or needing to know about all of this, it's going to be a helpful tool, I think.
I find the framing devices at the start and completion of each chapter particularly useful, and the chapters are bolstered by brief but significant, useful and appropriate asides, such as the "In Theory," "Apply It," and "Relations" sections.
Venturino's narrative voice is engaging and somehow compassionate - he understands this is tough stuff, overwhelming at times but, ultimately, a kind of play (even if some theorists/critics-who shall not be named-take it a bit too seriously).
At the very least, this is an excellent starting point that provides an overview of the "must knows" as well as suggestions for where to go to learn more, both of which are particularly useful for someone who might be familiar with literary theory in general, but not an expert in all fields (a feminist who might now be interested in ecocriticism, for example, or a structuralist who is diving into cultural studies).
I'm not familiar with "The Complete Idiot's Guide" series, but if this one is any indication of the typical quality/category of the collection, hooray, I say! I'm definitely willing to try another.