I really dislike the changes to the graphical user interface of the program. I felt that 2.5 was actual perfection in the interface. I really wanted it to remain the same.
I thought Windows XP was perfection in terms of a graphical user interface, but Microsoft thought otherwise.
A big consideration has to be that the program is no longer using Silverlight,which is another Micro&oft product left for dead that no one is supporting. As a result there are a number of changes that are probably unavoidable, while some others are by choice.