Microsoft Office 2010
Full user review
"Ribbons belong on presents and in girl's hair..."
Microsoft Office used to be good software before some idiot at Microsoft decided we needed a ribbon. Everything went downhill from that point.
The ribbon interface is a joke. An good analogy would be like putting a bunch of handles all over a basketball - it makes the ball easier to carry the ball to the game but nearly impossible to use when you get there and want to play.
Another poor iteration of what once used to be pretty good software obviously contrived to make Microsoft more money. If you're still using MSO 2003, there is absolutely no compelling reason to upgrade unless you have money to burn, want all of your projects to be late and need to add 30 - 50 points to your blood pressure.