Magnolia requires steep learning curve and more hardware to scale. I worked on [inFAMOUS2]infamousthegame.com
Well, actually it isn't very simple to learn and setup.. I like the way it cleanly separates content definition (pages and paragraphs) from the presentation layer, but I think it is somewhat overengineered in the storage and management, especially in the last releases. I found another interesting opensource CMS named WolfCMS that seems built on the same simple templating approach but is based on PHP.
The site with the comparision (cmsmatch.com) no longer exists.