Comment Ribbon got me to switch away from MS Office (Score 2) 235
I could never get used to the ribbon, so I switched to Openoffice and then LibreOffice, and never looked back.
The ribbon offers an interface that changes contextually and it's a nightmare for me. I want stability in my interfaces, not relearn basic things from scratch every time a new version of the software is released.
Switched to Linux for the same reason, mostly : consistent user interface. Pretty happy with ubuntu mate.