I too can no longer get into Stephen King, Patterson, and like a pp said, Crichton became too polical. Last one I enjoyed of his was about time travel, and I forget it's title.
I was terribly disappointed in John Grisham's The Associate. But I'm going to give The Firm a shot, since
Amazon readers gave that high marks.
I recently discovered Steve Berry. I started with the Venetian Betrayel. I hear he is compared to the Davinci Code author, but better. (though I've not yet read Dan Brown so I couldn't say). I started with his Venetian Betrayel. If you like the characters in that one (which I did) he writes several more with the same characters.
I also like Ken Follett (The Hammer of Eden was my first), and Stephen Coonts (Saucer, was very good).
If you like Science Fiction that's not too out there, I recommend Rober J. Sawyer. It was one of his books that inspired the series Flash Forward.