Depends what are your reporting needs. **Excel** is really user friendly and brings an easy drag and drop features including slicers etc. In combination with SharePoint and Excel services it is very powerful. Also as @Usman Butt mentioned, SSRS and Report builder are relatively good, but not so Drag&Drop as Excel. In case of MS SQL 2012 EE (BI) and Tabular Model, in combination with SharePoint 20120 EE you have PowerView (Project Crescent) which is fully interactive reporting and analytical solution. The only drawback or PowerView is that it can only works with Tabular Model and not with Multidiensional model. The issue is that current implementation of BISM doesn't contain DAX to MDX translation and PowerView is using DAX for querying.