Importing content into Drupal with Excel sheets is great for mapping columns to fields, especially for a non-technical client. But what if you have to import thousands of lines ?
On Drupal 7 at least, you will probably be stuck either by a number of lines limit, or by an excessive slowness of the import. Today I had to fix an import tool to be able to deal with more than 8000 lines of content, for a major company's Drupal websites factory. The tool was extremely slow and stopping at 200 lines.