Well, I'm sure the climate models are very useful as a feedback mechanism in the classic scientific method. I have a lot of faith in their usefulness there. But entities outside climate science have latched onto climate science and the models as a means of furthering their political, power, and control agenda. They are attempting to (mis)use these models in a predictive role, looking decades, even centuries into the future. These models cannot be used for that, and likely never will be scientifically defensible in that role. Ever. If I ever decide to go for my doctorate, I'll write my thesis on why climate models will never be able to predict the climate in 2100.
Was reading a great article by a climatologist who took the whole AGW crowd to task for being wed to the models. His contention was that they are more in love with what the models say should be than with what the data actually shows. Hence facts are totally irrelevant to them.