True. The start menu may not be as appealing and 'simplistic' as the ones found in the earlier versions of windows. I agree, when I saw that the start had been removed, a part of me died inside. Until I got some third party app to restore the start button, which also opens the metro style in a concise format, preventing the full screen process. If Microsoft can incorporate this, then it would definitely improve the responses from new and 'elder' users.
However, I state once again, the apps have been rearranged for the better. Accessing groups of folders of a specific type is easier, and with the type to search, its kinda fluid. I just didn't like it because of compatibility problems, but that's understandable since its just a preview.
One more striking part (which I truly loved) was the music app. It would automatically fetch data from the internet about the artist who's song you were listening to by displaying info, pictures, different albums and records. And it does this beautifully. These kind of apps will definitely improve user response.
The only challenge Microsoft faces is to appeal to both types of technological generations: old and new.