The compatibility test mentioned above [2] was performed in 2009. According to the LibreOffice release notes a lot of the positioning errors were fixed.
http://www.libreoffice.org/download/4-0-new-features-and-fix...
I don't know how you can claim that there are no serious problems with compatibility when you can't even import word docs that have charts or diagrams in them. This is stuff I was doing for my lab reports in HS and our marketing documents are full of this kind of material. These are not esoterica features we're talking about.
In a vacuum, LibreOffice / OpenOffice are perfectly usable word processors. In fact I prefer the LO UI over MSO's ribbon interface. The problem is MSO is the industry standard. So until they take compatibility seriously, they are going to be relegated to home users.
[1] https://bugs.freedesktop.org/show_bug.cgi?id=65865
I have to disagree with everyone here saying that basic MSO interoperability is some impossible goal. If that was the case how has TextMaker achieved such better results?[2] LibreOffice and OpenOffice both have a group of paid developers. While I understand that volunteer wouldn't want to work on this, why can't the paid developers put some effort into this?
[1] https://issues.apache.org/ooo/show_bug.cgi?id=96426
[2] http://www.infoworld.com/d/applications/office-compatibility...