Ditto on the 18-200 mm Nikkor coke-bottle. My lens is awful. I knew that there would be some compromises in a lens of that focal length range but I work in the desert and wanted to mate the lens to the body and never have to change it, particularly in the field.
I'm a geologist taking pictures of volcanoes. In some of my images, the distant mountains are so soft, I could fall on them without injury. I have been bitterly disappointed with this lens and it has colored my respect for Nikon.
I am going to get another lens when I can afford it.