I have never been in the Monadhliath myself but I've seen them from other places. The Cairngorms for example. The wind turbines they want to build will be visible from many more places and the areas surrounding these metal giants will be destroyed.
Chris Townsend has recently revisited the area and has written an arcticle on his blog. If you love the wildness of Scotland you should read it and use the link for signing the petition.
In the Netherlands building projects can be delayed for years on end, or even stopped, with the use of a law protecting rare species of animals or plants. Isn't there such a law in Scotland ?