If you are competing with Microsoft Office network effects, "Compatibility with Microsoft Office file formats" is the #1 feature. Everything else is a distant #2.

By definition, Microsoft Office scores 100%. What % less than 100% would be acceptable for Libre Office? If only 90% of the documents I produce render correctly in Microsoft Office, do any of the other features matter? It would be very interesting to have an objective test suite that calculates how close Libre Office is.

The other path is Google Docs which solves scenarios that are underserved by Microsoft. Like collaborative editing.