ER is the only really good thing Crichton has done (write about what you know, Crichton was a doctor I believe). Jurasic Park was a good film becuase Speilberg took Crichtons book and made a good story out of it.
I read Prey and ended up feeling that he took a great idea and then made it very mundane. He also has a tendency to make assumptive leaps and make them sound logical; should be a politician.
I think it's funny that Crichton criticises the piloticisation (sp?) of science and then peddles his own opinions on science in his books.