Based on just looking at the screenshots and limited amount of text, it looks like more of a report writing tool with basics such as filtering, rowcolumn pivoting, etc. Therefore, it would be fine for KPI dashboards and sales charts for the customers' dataset residing in the cloud.
For some, "business intelligence" would emphasize data-mining algorithms such as identifying clusters (k-means, etc), dimension reduction, etc. If QuickSight also has these capabilities, it doesn't seem like Amazon is advertising it.