At the moment the list reports are good and provide useful data.
The reports can be better by allowing users to create charts (pie-chart, bar chart) etc based on the data.
This would be useful when a report has a grouping i.e. a list of customers grouped by country, this is good as a list and the list can show you the number of customers in each country.
A pie-chart would be better as this would show you the number of customers by country and also the percentage of customers by country.