Some people don't like the Ribbon, but I love it. As a new user back in the day and a "power user" today, I think it's loads better than the semi-random arrangement of cryptic menus and toolbars we had before.
In my opinion, Microsoft Word 2007 did it best. Later iterations did away with the app button and menu in favour of the obstructive "backstage" menu, and I don't think the flat design does it any favours.