Physics Today (Wolfgang Hollik, MPI Munich):

"Quantum Field Theory and the Standard Model may be considered a successor to Michael Peskin and Daniel Schroeder’s An Introduction to Quantum Field Theory (Westview Press, 1995), which for almost 20 years has been a standard reference."

Full review (Dec 2014)  can be found here.

Mark Wise, California Institute of Technology says:

This is an excellent graduate-level relativistic quantum field theory text, covering an impressive amount of material often with a very novel presentation. It would be ideal either for courses on relativistic quantum field theory or for courses on the Standard Model of elementary particle interactions. The book provides interesting insights and covers many modern topics not usually presented in current texts such as spinor-helicity methods and on-shell recursion relations, heavy quark effective theory and soft-collinear effective field theory. It is nice to see the modern point of view on the predictive power of non-renormalizable theories discussed.

Once in a generation particle physicists elevate a quantum field theory text to the rank of classic. Two such classics are the texts by Bjorken and Drell and Peskin and Schroeder; it wouldn't surprise me if this new book by Schwartz joins this illustrious group.

Nima Arkani-Hamed, Institute for Advanced Study, Princeton says:

A wonderful tour of quantum field theory from the modern perspective, filled with insights on both the conceptual underpinnings and the concrete, elegant calculational tools of the subject.

Michael E. Peskin, SLAC National Accelerator Laboratory says:

Matthew Schwartz has produced a new and valuable introduction to quantum field theory. He has rethought the whole presentation of the subject, from the introductory and foundational concepts to new developments such as effective field theory descriptions of quark dynamics. Students will enjoy viewing quantum field theory from his perspective.

Howard Georgi, Harvard University says:

Schwartz's book grew out of a popular year long course in quantum field theory at Harvard. Designed primarily for graduate students, this course also attracts and inspires a number of undergraduates each year. The book is unique in its combination of breadth, depth and readability. Schwartz starts at the beginning of the subject and brings us right up to the present. That the book is neither superficial nor impossibly dense is rather remarkable and makes it easy to understand the course's success.

Edward Witten, Institute for Advanced Study, Princeton says:

In this book, Matthew Schwartz gives a thoughtful and modern treatment of many classical and contemporary topics. Students and experienced researchers will find much here of value.

A review by Thomas Peters, University of Zurich in Contemporary Physics can be found here.