I tried OpenOffice of several versions, over the years, and all of them were buggy. The latest one, for example, corrupted the watermark in the document. This is unacceptable
I agree - unacceptable.
However - try being in a situation where you are sending documents to an intermediary who translates the document into your client's language (and vice versa of course), and ending up with the document describing the 100 million euro project, CRASHING Word, as soon as the document crosses 100 pages.
Then imagine calling Microsoft's quite expensive business support, asking for help, and flat out being told, that this is a known issue for documents that traverse different language installations, and that there is no forthcoming fixes for this bug, and that the work around is to keep the documents below 100 pages.
At that point, it either becomes a beaurocratic nightmare to keep track of every piece of the 2,500+ page document, OR you simply instate a simple rule of always opening the document in Open Office, saving it in Word format again, and then opening it in Word, after which there were NO crashing issues with the large document. A few layout issues, but no one really cared about that.
Granted, that was about 10 years ago now, and I have no idea why the hell that work around turned out to work, but THAT is a horrible type of bug. It is a show stopper, and quite frankly much worse than a watermark corruption issue.
Now, do competing suites have issues? Yes, they do. But for some reason the relatively trivial issues that they have always trumps the game stopping bugs that probably still exist in MS Office, simply because "that's what everyone uses".
And this applies to all the dominant pieces of software. Doesn't matter what they are.
And in case you hadn't noticed, I seriously hate that attitude.