Is There a Value On SIEM Product Without really Powerful Correlation Capability?

Most of the time, it is hard to evaluate the correlation capability of SIEM products. Also, there are no articles, documents about deep analysis of product correlation capabilities. Most of the materials reachable are sales and presales documents. Technical documents are mainly product guides.

Since it is hard to evaluate correlation capabilities, end-users will use what they buy.
For end-users, evaluators, and consultants, there are very deep technical comparisons between well-known and promising SIEM products.

The Math of SIEM Comparison.

Comparing Detection Capabilities of SIEM Solutions with Their Costs

Comparison of Detection Methodologies in SIEM. Correlation and Search.

What Really Matters When Selecting a SIEM and How to Choose a SIEM Looking into the Correlation?

How to Select the Right SIEM Solution?