Reading for multiple sources: Any modern Database, Files, WebServices, etc.
Monitoring and scheduling task dependencies for data loading purposes.
Really useful to design a Data Warehouse, thanks to its built in components for design patterns like SCD, etc.
It's also useful to publish data interfaces via WebServices or REST.
Good and high qualified support team.
Connecting to various databases from classic Relational (MSSQL, Oracle, MySQL, etc.) to No-SQL Databases.
Community which provides plugins, etc.