I agree. There are some really great product search engines available in Germany (geizhals.de and idealo.de) that allow you to search many many articles by custom criteria (depending on their category) and then do a price comparison.

Amazon lacks basic search filters. And it has a lot of other annoyances. For example when I search for shoes in my size, Amazon won't display the price of the shoes in my size until I click on the shoes. Instead of shows the price range for all sizes in the list of shoes. Makes it a huge hassle to browse through a lot of shoes.