Are you just not using it and going on something you read or heard?
I've tried opening about 50 various Microsoft Office documents (2003/2007) on the iPad on several occasions. Heavily formated pages or large documents seem to have the most issues, I've had about a 30% crash rate. With about 10% of the documents not opening at all... and ones that do open can have severe formatting issues. Conversely, when I've saved documents on the iPad and tried to open them in Office the formatting issues still exist, but are fewer.