The big chore I've come across with Report Builder is translating all the database fields into recognisable form for end users eg: only after a few years working with this database, I've come to recognise the cryptic a-re-dte ( not my choice in naming conventions  ) is the Actual Receipt Date field, as opposed to re-en-dte which is the Receipt Entry Date field.

It would also be good to see a few more report templates available. After using the Visual Studio Report Designer to produce some promising reports with Detail, Summary, Matrix and Graph all on one report its a little bit of a come-down to be limited to such basic report templates.