I have used the book as a lecture assistent, and helped students during class sessions to work out some selected problems from the book. The problems are quite all right, and hints to all exercises are in the back of the book, well actually their not hints but like shovels to the forehead! You just have to xerox them onto paper, some additional remarks or rephrasings and you're done technically.
The text, however, is awful, although, it's easy to read. The book is designed for undergraduates with minor knowledge of quantum mechanics, but if you don't know a lot of quantum mechanics and quantum field theory, almost all interesting pieces come out of the blue including formulas and their "derivations". What is in this book can be learnt from popular science books on particle physics. Of course, you will miss out on the formulas, but at least you think you can understand it and you will see the historical development.
For example, P-parity, C-parity, CP-invariance and violation, CPT-theorem, weak & quark mixing, weak selection rules, decay rates, etc. are all ill-defined or not at all, so really understanding them is impossible:
(*) Parity is discussed for fermions without stating the Dirac equation, which does not give much insight to its origin and relevance. A discussion of fermions without it is useless, unless you use only the Pauli principle and some loose arguments that are dropped as experimental facts.
(*) The decay rate is never defined (properly) in the book, although many numerical values are given throughout the book for certain processes. Moreover, two exercises in the 10th chapter ask you to show that two decay rates are equal under certain conditions, which is quite impossible, if you don't know what it actually is that you should try to prove.
Some topics are done too briefly, because the authors don't want to be too technical, but feel they cannot leave things out:
(*) Drawing Feynman diagrams is discussed nicely, but the "notation" for certain propagators and external lines is not in accordance with literature. The purely topological aspect of these diagrams is competely neglected, so it's merely presented as a "neat thingy to do without any particular reason", unfortunately.
(*) The gauge principle is mentioned and shown for electromagnetism very briefly and in non-covariant form, but it does not deal with it properly: either mention it and leave it, or do it properly, but don't create a cliff-hanger and then cut the safety rope.
I know this book is not intended to give undergraduates complete understanding of particle physics, but I cannot recommend it, unless you want to know some "tricks" in processes before you do the real deal in QFT courses. The effort Martin & Shaw have made is nice, the result isn't.