The "average user" is not the one targeted by Office 2010, if I recall correctly, but the IT dept. whose boss/mayor/president may wants open standards documents.
The "average user" is still running Windows XP to surf the web (watch pr0n) and play video games and he is fine with his copy of Microsoft Office 2003.
I just installed the 64-bit deb on my Ubuntu machine and launch it just to see that it's just a Wine application.
It also brings integration into KDE and Gnome
My ass. It's just the Windows version compiled with winelib and on my Ubuntu desktop it is really looking ugly. And I mean more than usual for a wine application. It's all "Windows 2000" greyish.
Look for yourself http://twitpic.com/1b8ds2.
Not free, not native and really ugly. Don't bother with it.
The moving cursor writes, and having written, blinks on.