Jack Reacher books are good, I like them.
I bought a book by James Patterson once... Well, at one point I was seriously considering putting it down. You know, in that book the main lead (sending the character to africa to find the bad guys) was delivered by a bar tender. 'HAY I think those guys were africans'.
I think he's just spent lots of money on marketing, rather than writing good books. Anyway, other ones by him might be decent but I'll not bother looking.
Andy McNab's books, well, the one I read (exit wound?) was pretty good.
Terry Pratchett is good too. I dunno if anyone's mentioned him