Dan Brown's plagiaristic tat is OK - as long as you don't go all Catholic and just remember that clever people weren't supposed to take it seriously. Angels & Demons was too heavy on a single premise, making the whole thing much too predictable. The Da Vinci Code was just plain silly, but slightly more interesting and well-written than the equally silly book (Holy Blood, Holy Grail) of which it was basically a remake. Inferno had a very slight plot which was entirely revealed in the first few pages - everything after that was just running around implausibly escaping being shot at every two seconds. The Lost Symbol appears to be an attempt at a sequel to Thomas Harris' Red Dragon with the names changed.
Would I read him again? Yes, but only when I don't want anything to think about. Having read (and abandoned half way through due to utter boredom) Under The Dome, it is doubtful that I will ever read Mr King again.