The MS Office apps, and especially MS Word, suffer from a disease that I call "too smart". They try to save you time by guessing what you have in mind. When they are right, they seem very clever indeed. In Word, paste a word between two other words and an extra space appears. In Excel, type "Jan", "Feb", and extend a column down, and you get "Mar" etc.
But... when things go wrong, because the app's rules aren't what you wanted or expected, you can become quite confused. Sometimes, when you paste text or delete a paragraph, the style of the adjoining paragraph changes. Sometimes, changing a style doesn't affect the paragraphs you think it should affect. Sometimes print settings don't work as you'd expect. Getting the image properties to put an image where you want can be an exercise in frustration. Getting autonumbering to start and stop on the numbers you want can be hard. All of this can be explained and mastered once you learn to think like the program and see eye-to-eye with its habits. So if you use Word 8 hours a day or are willing to read Help pages or a manual, you can get quite efficient. Otherwise, you'll be one of millions cursing at your screen and wishing you had Bill Gates' home phone number.
That's one reason why a less-clever program like AppleWorks can sometimes be easier to use than a powerhouse, particularly for beginning or casual users.
P.S. Don't bother telling me if you personally don't have trouble with the particular troublespots I mention above. I've seen a number of people trip over exactly those issues, and they weren't idiots or people who hadn't met a word processor before. Some of them will take the time to master those features, but a lot of people would be wiser to stick with a simpler program.