Like NT said, I think it really depends on the intent of the image. I like to look at pictures of a pristine wilderness, but for my own work, I find myself more drawn to compositions with some sort of 'trace' of human presence. I find the idea of nature claiming back what man has tried to make his own very intriguing, and a bit haunting. In my personal work, I feel it makes for a more powerful image... but then, coming across a beautifully unspoilt landscape is always marvellous!