It takes roughly 60 UI actions to install QGIS on a Mac. And then you only get QGIS 2.0, not the latest 2.2. The problem is the official install is KyngChaos’ packages. They’ve done a great job over the years packaging Python and GIS software for Macs, but it’s seriously old school stuff. 4 different framework libraries have to be installed first by hand, each one individually packaged in a PKG installer script inside a DMG, then you install QGIS itself. Each installer takes many mouse clicks to install and also requires the root password.
In some sense KyngChaos is doing this right; the libraries he installs are useful for other projects, and this way you see all the license and components. But it’s really user unfriendly. It’d be nice if someone built a single self-contained QGIS.app that could just be dragged and run anywhere.