Simply have a look at their running ad: www.macoffice2008.com
Now let's see how many menus they present to a user:
1. The standard Mac OS menu in the top line on the screen.
2. The toolbar menu (with text labels) below the document title.
3. The "ribbon" menu top line of tabs.
4. The "ribbon" menu lower line of tabs.
5. The "ribbon" menu icons
6. The Formatting palette, floating.
This ribbon menu is the "New & Improved" stuff, and I think it's not done properly.
Just look at how all those menus took 1/3 of your screen, in vertical dimension!
I think it should've been made into a floating palette (MacOS X "drawer" UI concept comes to mind), since the ribbon menu is not needed all the time.
Or, at least, make the menu vertical, not horizontal.
The new DVD-aspect-ratio displays invite you to explore the width, not the height.
Had they made the ribbon menu a vertically floating palette, things would look much better and less cluttered.
To sum it up, current MS UI philosophy seems to be
"First - our Product, then - your Document".
They put the document you work on into a corner of what's left after their "new feature marketing" people put all those new shiny icons in the "prime space" which should be well reserved for your document.
They forget that [their] Tools are less important than [your] Trade.
Luckily to them, the Corporations world is deep entrenched in their legacy.
But as for the Personal world, it's high time to think of alternatives.
Apple's iWork package is something to be in terms of UI and usability, while maybe lacking more advanced features and complexity required in daily Corporate business.
