Rating: 
Summary: must have!
Review: This is an excellent text for QFT; however I'm not convinced it is the best introduction to the subject. At times it can be overly dense and cumbersome with notion. Nonetheless, this is one of the best references out there. In particular, the treatment of bound states in QFT is the best I've seen. Weinberg also provides extraordinary insight into the subject.
Rating:
Summary: Outstanding; Clearly the best book on the subject
Review: This is THE book on quantum field theory. The only blemish is the idiosyncratic metric used. It is quite thorough, very cleary explained (though he could have done a better job in some places) and coherent. There is no other book on the subject that comes close.
Rating:
Summary: Get the second printing (1996) with corrections. Superb!
Review: Weinberg is one of the greatest physicists
of this century. He is also one of the best
writers on the subject of physics. His two
volumes on quantum field theory are the best
books on this subject and probably will remain
so for many years.
A second printing of the first volume was
issued in 1996 with many minor corrections
of typographical errors.
Rating:
Summary: An excellent treatment of quantum theory of fields
Review: Weinberg shows not only his mastery of the subject but also his skills as a teacher. The book is easy to understand provided one has mastered relativity and quantum mechanics. It would be an excellent complement for anyone who has read Bjorken/Drell or Peskin/Schroeder. In my opinion, a true understanding of quantum field theory can only be gained if one reads Bjorken/Drell, then Peskin/Schroeder and then finally Weinberg. In his book Weinberg is sort of recombining the best of Bjorken/Drell and Peskin/Schroeder and brings understanding to a new level. It is in a sense like with having read quantum mechanics by say Messiah and then reading Landau. Reading Landau first is not a good idea, but doing it after Messiah is. The same thing applies for Weinberg but for a different reason. His insight is more sparking that way.
Rating:
Summary: An excellent text in QFT
Review: Weinberg's book can be considered a masterpiece in QFT. The quality of physical insight, the mathematical details, and the logical coherence of the development of the subject as a whole are simply brilliant and outstandingly original. The book assumes a certain level of mathematical sophistication on the part of the reader; this, however, is essential; without this, the technical grasp of the subject cannot be complete.One note to readers who wish to purchase the book:
I had a bad experience with Amazon on this purchase. They shipped me an older print of the book at the current price of the latest 2002 print and refused to correct the problem. I had no alternative but to return the book and obtain it from another source. So, be aware of this problem if you wish to buy it from Amazon or elsewhere. Make sure you buy the latest edition. There have been quite a few corrected editions since the book was first published in 1995 by CUP.
Rating:
Summary: It is very nice.
Review: Weinberg's book is very nice.It is clear,clean,with very little errors.But in some places it is a little dense and difficult to understand.For example,Appendix B of chapter 2 is hard to understand.Anyway,the book takes a very elegant language of group theory to show clearly why QFT interpretes the nature.With the great interest in group theory and symmetry,to read the excellent language of QFT through the mouth of a great physicist is a great pleasure and intelligent challenge.
Rating:
Summary: One of the best
Review: Well, this is an excellent book if used together with a more simple one (Ryder, Kaku, or Peskin/Schroeder): in fact you can find almost everything in Weinberg's, and every topic is treated in a clear but deep way. I mean, the book gives a reason for everything. This has two consequences: the first is that, reading all of it, one will get a strong basis of QFT, the second is that this could cost more time if one uses just Weinberg's. That's why using it with Ryder's, for example, is a good choice. I still have to read the 2nd volume of Weinberg trilogy, but it seems to me that his work lacks of a modern geometrical approach: this is the only negative aspect I could point out, and that's another good reason for using it together with another book. Briefly: the book is excellent as a strong support.
Rating:
Summary: Good if you know math and not much physics
Review: You can read Weinberg's textbooks with joy and profit knowing a decent amount of mathematics and not much physics. Both "Gravitation and Cosmology" and "The Quantum Theory of Fields:vol I" are very self-contained. The ideas develop beautifully, naturally, and clearly. You might have to re-read but you won't need another reference for the topics that he covers, and you won't be overwhelmed with inessential or improperly motivated material.
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