"Quantum Field Theory in a Nutshell" is praised for its engaging approach to quantum field theory (QFT) and its ability to provide physical insights rather than detailed calculations. While it serves as a valuable supplement to QFT studies, it is not suitable as a primary textbook for learning the subject due to its superficial treatment of complex topics. Readers are advised to use more comprehensive texts like Ryder or Peskin and Schroeder for serious study. The book is noted for its unique perspective on both relativistic and solid state field theory, but it is criticized for lacking depth in explaining the intricacies of relativistic QFT, making it less effective as an introductory or reference resource.