YMMV - I just cursed LibreOffice a few minutes ago while trying to open and fill in a form (amateurishly) built in Word. When loading it, it obviously didn't look as it was intended (text boxes were overlapping and partly obscuring each other), but it was more or less Ok. But after filling it in, it wasn't able to print it - the print preview only showed an empty box! I then proceeded to upload it to Google Docs, which also didn't show it as intended, but at least managed to print it.
Yeah, I already politely suggested to the people who sent me that document to use PDF instead (just in case they were wondering why the document they received back looked different from the one they sent). Nevertheless, LibreOffice claims to support this document format, so users will complain if the support is not up to scratch...
Yes, the overlapping boxes might be because of a missing font, but for me the kicker was that the document looked completely different (with most of the text missing) in the print preview - not to mention that it was spread over two pages, although it fit on a single page while being edited.
