Why to put unstructured data in NoSQL DBs?
Check the comparison where NoSQL has better results.

NoSQL databases can store structured, semi-structured and unstructured data. Their main advantages focus on semi-structured (JSON, XML, not all fields are known) and unstructured.

But, you can safely store BLOB in a RDBMS, e. g., Oracle Database and many others relational databases.


  The people talking about NoSQL be a better sollution to store
  unstructured data, not always had built an IT infrastructure, and
  they're replaying what they heard.
  
  Also the trend to think that newer is always better push to this.


But some scenarios NoSQL+unstructured data could be better: to scale out, hundreds of db instances, big data and cloud.