Could not agree more. I often have to use Fantastic fiction to determine order of ebook series. Then I rename the ebook file and the metadata to reflect my chosen naming convention;
[series name book number] - [book title]
Lost Fleet 03 - Courageous
Here is an appropriate Fantastic Fiction link for the example above;
http://www.fantasticfiction.co.uk/c/jack-campbell/
It would be nice if the original downloaded ebook title reflected some form of series order.