One of the biggest complaints I have for websites that host software projects is a tendency to assume you know what the project is about. A couple of clicks to look at the main page, documentation, and getting started, and there is not a single paragraph that tells me what mesos is for. So my eyes glaze over and I move on.
I agree. This is a sub-page talking about a particular release though, so it's not a landing page or "front page".
Clicking the logo works and gets you to the project's actual front page (http://mesos.apache.org/), which has a decent description:
Apache Mesos abstracts CPU, memory, storage, and other compute resources away from machines (physical or virtual), enabling fault-tolerant and elastic distributed systems to easily be built and run effectively.
That's still pretty abstract of course, but at least it's attempting to answer "what is Mesos?" first thing on the page.
Fair critique, but this is a release notes page and not really the front page. Here is likely the bat article on what mesos really is from a high level:
