There's only one thing I can't stand about the MS Office suite: it keeps trying to dominate my system and file extensions! Since I play around with .CFG's a lot I assigned them to notepad, but MS Office keeps reassigning them as "Microsoft Office Configuration Files" with that little dinky MSO logo, and they're not actually assigned to any application.
Other than that, the slow start up for the any of MSO's apps is not impressive. I generally use WordPad just because it loads up a hell of a a lot faster than Word. But I keep the suit around because I sometimes need to use Powerpoint, Excel, and Access. Also occasionally some of the documents I have to review are in Word format.