The problem is that NoSQL is such a broad term for datastores. Some of them are simple (like redis) and some more complex (like Cassandra/HBase). They also have

The problem is that NoSQL is such a broad term for datastores. Some of them are simple (like redis) and some more complex (like Cassandra/HBase). They also have different targets for data types. Using one just because it is a NoSQL can be a premature optimization just like using a RDBMS can be a premature optimization. You really need to understand the data and how it will be used. Before you know what you want to build, it is easy to prematurely optimize for something you don't need. Start simple, then iterate...