That's unfortunate for you. With your loyalty to MS Office it will always remain the "standard". While I agree that some things don't convert "perfectly" it's usually very miniscule. I use iWork 09 when I use Keynote to play PPT files it may have a very slight change but for the most part it's about the same.
What this tells me is that you hardly scratch the surface of what Office apps can do. For you, iWork is sufficient, and so is OpenOffice and all the rest. Which is great. For some of the rest of us, this is not acceptable (and downright insulting for you to imply that that is somehow OUR fault). Various reasons have already been given: iWork and the various free office clones simply don't support a number of advanced features. Yes, many of us don't need them, but there are many that do.
To you, compatibility might not be an issue. But many of us need to share our documents and spreadsheets with the rest of the world, and the rest of the world uses Office. I have a hell of a time working with one friend who insists on importing Word docs into OpenOffice, making his changes, then sending them back to me as converted Word docs. All the layouts are broken and I spend so much time fixing things that I might as well have done the work myself in the first place. I'm looking into Google Documents as a possible middle ground. Also, I'm going to insist that I do all the document formatting myself.
Sorry, but your loyalty to MS Office will keep MS very wealthy. You have to change at some point.
And it's your blind loyalty to Apple that perpetuates the stereotypes that Macs aren't compatible with anything -- because people like you don't WANT it to be compatible.
Look, I don't much like Office 2008 either (I'm VERY tempted to put 2004 back on), but the reality is it works, it works pretty well, and it's what everyone expects you to use. I use Pages whenever I can, and export to PDF all the time, but there is the odd time when Excel or Word or PowerPoint is the only thing you can use.