The Expose bugs alone make Word virtually unusable - for example, you click on a tiled Word document in Expose, and it doesn't come to the forefront. Nor does choosing that windows in the Window menu bring it forward. And, believe it or not, it used to be worse before SP1.

It has been 7.5 years now since the initial release of OS X 10.0 and, honestly, Microsoft has yet to release an office suite that actually works well on OS X. It's so bad that I basically avoid Office at all costs now except when I have to collaborate with someone else who is using Word/Excel. I'm hoping that the next version (Office 2011?) will finally behave like a real OS X app, but I'm not holding my breath.