Haven't seen the data, but I assume that not all users got it better (that's kind of impossible in most scenarios?) but that on average it got better?
Me personally like the ribbon concept and feel like it was a good improvement (because I could see the long term benefits) even if it meant I had to re-learn significantly.
That data may be very interesting to differ between average, mean and median. If most of the people are not pro-users, the average may increase significantly, while the mean may not.
Me personally like the ribbon concept and feel like it was a good improvement (because I could see the long term benefits) even if it meant I had to re-learn significantly.