I picked up the latest Jack Reacher novel while we were in Ireland (it was for sale in the UK before it was for sale in the US, although it's for sale here now). This is a picture of the UK cover, which I think is a better graphic design than the US version.
I'll preface my review of this book by saying I'm a big fan of the Jack Reacher series, enough that I've gone to see Lee Child read from the books several times here in San Francisco. While I don't think the series is even close to being the best series in mystery/crime fiction (Mickey Spillane sailed the seas in this subgenre decades earlier and more consistently, although Spillane wasn't as complete a writer) or even a contemporary mystery/crime series (Adrian McKinty's Michael Forsythe trilogy is miles and miles and miles ahead of anything Child has done, McKinty may well be one of the best fiction writers of the last 40 years), the Reacher series has been consistently satisfying. I think that is due, in large part, to the Reacher character - Reacher is a wonderfully strong (fiction-wise) and larger than life character. So much so that I think the Reacher character carries some of the books in the series.
Child has spoken often about his method of writing the books - he doesn't plot in advance. It shows in this book and it's the weaker for it. Child is a very good technical writer in that he doesn't write bad sentences, but this book meanders around a lot. And I don't mean that in the sense of obfuscating the plot, I mean that in the sense that I'm not sure Child new what the plot was. Reacher's character is strong enough that the book is still mostly satisfying, but the plotting deficiencies had me constantly thinking that I could have written a tighter and more compelling book - not a good feeling when I'd paid 13 Euros for a paperback.
For fans of the series, this book will be a must read; but for someone who wants an introduction to Reacher, there are a couple of earlier books that would probably be a more satisfying read. The Hard Way is one of the more recent Child books that was excellent. You might also try Killing Floor, the first Reacher novel (I'll apologize in advance for the improbable coincidence at the ending - other than that, it's a strong, well written book).
My last criticism of the book is that Child is wearing his liberal politics on his sleeve here. Detective fiction is largely escapist literature. I don't think authors owe their readers much: I don't think authors should have to do public appearances, I don't think authors should have to continue a series after they've tired of the characters, I don't think authors should have to respond to correspondence from readers. I do think that authors owe their readers a consistency to the norms of the genre. If Child had wanted an outlet for his politics, he should have written a nonfiction book or a mainstream fiction book.
If tough guy crime fiction floats your boat, you might skip this book and look to Robert B. Parker's early Spenser novels - no one is tougher than Hawk. The Judas Goat and Ceremony are both exceptional detective fiction examples. Parker's fiction jumped the shark a few books after Judas Goat and isn't much work following.