Like many, I've used Word for years, but I frankly think the only reason to do so is the massive installed base. If I didn't have to share docs with so many other Word users, I would have stopped using Word years ago. Why? Let me count the ways:
1. It is classic bloatware, due to MS continually adding new "features," most of which I don't need or want;
2. As a result of 1, it is hopelessly confusing - yes, you can change virtually anything about it, but just try figuring out how to change something the first time; it typically takes way too long, and when you do find the solution, it's usually buried deep in some menu that has an opaque name that sounds like it has nothing to do with what you are trying to accomplish.
3. Ridiculous formatting behavior. I'm a lawyer and am constantly using heavily formatted pleadings and briefs to meet court format requirements. I am forever wasting time trying to fix some formatting issue, and this is much worse than it has to be because MS makes so many idiotic formatting choices.
As one of many examples illustrating these problems, I spent over an hour yesterday trying to figure why the lines in my brief didn't line up with the line numbers in the margin. It turns out this is due to a stupid choice MS made to have extra space appear above the line rather than below it when you set your font size one way ("Exactly 12pt"), and below the line when you set it another way (Single, double, 1.5, etc.). To make "exact" font sizes behave correctly, I had to search through multiple layers of options, most of which were given confusing, misleading, or at best opaque labels, and then check a box for "Don't center exact line height lines". Of course, the problem was not that they were centered in the first place, so this label has nothing to do with reality. I was only able to figure this out because of a helpful post in the forums (not, of course, from any MS employee).
This is truly atrocious software.