With 100+ NoSQL / BigData Databases in the market, I am seeing a lot of marketing buzz claiming that BigData will addresses all the Business Intelligence (BI) challenges. These marketing folks try to portray a nirvana system where you just push the raw data into the system, and out comes intelligent analysis, magically. That's is not how it works. You need to have intelligent people who can create meaningful MapReduce jobs to synthesize the raw data. There is no silver bullet. There is no magic to BigData.
BigData addresses "some" Business Intelligence (BI) problems very efficiently, but you can't throw BigData at ALL BI problems. Problems that you have traditionally solved using Relational DBs efficiently, may not be the best fit for Big Data. BigData is good for prediction, trend-analysis, and graphs.