I can understand your concerns regarding moving from Word 2003 to Word 2010, especially after reading those reviews on Amazon. I perused them and, though genuine concerns are brought up, much misinformation is contained within.
Certainly, the ribbon interface takes a bit of getting used to. After using Office 2007 for a while, I became quite used to it. So much so, in fact, I yearned for the interface to be in Outlook, too. So, I upgraded to Office 2010 where Outlook gets the makeover as well as the rest of the suite.