It is awful, but so is office on windows. I get so many weird lockups, crashes, and file desynchronizations. Office is one of the worst pieces of software I have to run in windows.
This was years ago now, but I got thru college with a Macbook Air using the "Office Online" apps because the native apps were so unbelievably sluggish and resource hungry. Somehow the web apps were more performant.
When I worked at apple I wasnt the only person who ran office in a windows vm. It was a supported config.