Hi Ritesh,
We are seeing these issues:
1. Schedules reports failing with FRS error
2. BIWS not working. Fixed in SP6 P1
3. Lot of core dumps.
4. API errors (when idle on a document, or when trying to save a report, etc) - this is intermittent
5. Publications - not able to use xlsx instead had to use only xls files
6. Search not working properly - search is showing reports from other users inbox, and not able to see the report I searched for
Hope this helps!
Thanks!