Dashboard capability along with tightly integrated enterprise level security are really the most used features for me in OBIEE. It's also capable of delivering Scorecarding, Geo Mapping & multi source capabilities.
Room for Improvement
End users can't change their password on their own.
Use of Solution
Customer Service and Technical Support
Oracle support has always been quick.
Initial setup is straightforward through a wizard based interface.
OBIEE is a truly enterprise level product with the capability to scale & tight security. But it requires a specialized technical team during customization which might make it not economical for small scale customers.