Rating: 
Summary: A great book; better when supplemented
Review: This is a difficult book to review. That a detailed study of several textbooks is needed for a thorough introduction to QFT is a well-known maxim among students of the subject. Every QFT text excels in some areas and struggles in others, and Peskin and Schroeder's book (P&S) is no exception. P&S chooses to emphasize performing calculations in the Standard Model (SM), and the chapters pertaining to this topic are excellent. Chapters 5 and 6, covering tree and one-loop calculations in QED, are invaluable, as are chapters 20 and 21, which detail the electroweak theory. Several of the formal aspects of QFT are shunted in P&S, as must something be neglected in every QFT text that is stable against gravitational collapse. The general representation theory of the Lorentz group is the most glaring omission in P&S. Chapter 1 of Ramond's "Field Theory: A Modern Primer" treats this topic quite well. The LSZ reduction formulae are derived and discussed more clearly in Pokorski's "Gauge Field Theories", as are BRST symmetry and free field theory. For those interested in undertaking detailed phenomenological studies of the SM or some extension thereof, Vernon Barger's "Collider Physics" is also recommended. Despite its shortcomings, P&S remains the best QFT reference currently available. It's the book I turn to first when confronted in research papers with field theoretic puzzle that I just can't crack. If you buy only one QFT text, buy P&S.
Rating:
Summary: Best book I've read all day!
Review: This is a good introduction to quantum field theory, suitable for an undergraduate or advanced high school course. It's primary weakness is its lack of discussion of world-line techniques, which have essentially made Feynman diagrams obsolete in recent years.
Rating: 
Summary: great book unless it's your first experience with QFT
Review: This is a great reference, and I think it is a must for any student in the subject. It offers a unique perspective of the physics; however, some of the calculations are sloppy (typos, etc). There is also a relatively thorough appendix (lots of good stuff that is commonly refered to). I'd suggest this book to an intermediate level student, but I don't think that it is the best book to introduce a reader to the subject (try QFT by Brown).
Rating: 
Summary: Horrible book!
Review: This is by far the worst book on QFT that I know of. There is absolutely no logic or motivation. One doesn't learn concepts or computational techniques. There are many other modern texts available which are much better. Try Weinberg or Sterman, for example.
Rating:
Summary: The best book on QFT
Review: This is the best book for learning and teaching quantum field theory. Although it doesn't cover philosophical or very formal aspects of QFT, it is very readable and more than sufficient to teach a year long introductory course. This book is also excellent for self study. Unlike Weinberg which is too formal or several others that are too specialized, Peskin & Schroeder presents a nice general overview of the topic.
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