I dunno, I like it a lot better than anything else Microsoft has done since. I'm all about really BASIC shit: my favorite UI was the Mac OS9 classic.
It seems like the flashier and more colorful a UI gets, the less impressed I am. Skinning and themes are a complete waste of time IMO.
Man, uploading that picture of the Mac OS 9 GUI to Wikipedia was the best idea ever. Every single time a blog or article has done a story on user interfaces, it's had my name plastered all over it. Just look at the bottom menu.
Also yeah I'm a big fan of the Mac OS 9 interface. Though it's not as sophisticated as the recent Mac OS X interfaces, which have a few more years of research on it, it's still amazingly useful by today's standards. I also really don't know why they got rid of some of its better ideas, like the tabbed windows.