Being a long-term Ubuntu Gnome user, I can definitely understand how die hard hackers hate Unity. But on the other hand, Unity makes some Ubuntu users re-think what they take for granted for last 5 - 6 years and re-examine the world around.
Let's check the Linux users that accessed Wikipedia in September and October 2011 to see the huge impact of Unity.
A controversial product from Apple and Microsoft will hurt their users, while Linux users as a whole will benefit from such a product. And this is the spirit of FOSS.