This book is something that I would consider a seminal work of film criticism, and in its own way shows how the internet and home video have changed film and film criticism.
Because of the internet, and the ability to take films home with us, the obscure films, the flops and the bombs have a chance to get legs, find their audiences later on, and get the fan base and success that they have so richly deserved, as with Joe Vs. The Volcano & The Rocketeer. Alternately, they preserve failure and the bizarre cinematic decisions that lead to those failures for all time, as is the case with films like Mame and Pennies from Heaven.
Honestly, if you want consider yourself a big fan of film, I'd definitely consider this book worth reading.