I cant believe the article puts him in a class with john grisham.
And i dont think its just my subjective opinion either. Look at the movies that have been adapted from their works in comparison. Grisham’s books were interpreted into a ton of thrillers that were successful & have stood the test of time. Same with other thriller writers. Koontz movies have universally flopped into obscurity. And while not all good books can be made into movies, its a reasonable test for a thriller.