I think this post (and the home page) would benefit greatly with some example dashboards and queries. You really have to dig deep into the docs to see what it is capable of.

Splunk on the other hand has dashboard examples on almost every page (on their homepage, a carousel with five different examples of the things they purport to solve).

(another blog post does a great job with showing off capabilities: https://www.gravwell.io/blog/gravwell-and-collectd )