Thank goodness they reintroduced the comments sidebar. Not sure what they were thinking with the rollover UI. Awful.
I completely agree about the iWork sidebar, but the ribbon in Word is even worse, IMO. No customization so I have to move back and forth between two tabs to use the only 3 functions I use. Also Word's performance is a lot worse.
While the MS Suite is probably the best suite out there, I hate the fact that they change the interface by every release. This week I got a new computer at work with the new W8 + office and I can start all over again, every f****ing function is now hidden in another place. Who in his right mind comes up with such a nonsense...and yes please don't tell me that you get used too it in 2 or 3 months; ridicules.