Whether or not you use an SSG, I find the biggest hurdle is getting/making a good theme for your blog. It looks like this comes theme-included, which is actually a pretty big deal if you want to get up and running fast.
It's a nice to have to get started quickly when you don't want to custom build a theme or you want someone else to figure out a lot of the basic configuration.
As Ghost is MIT, my idea was to use the same engine, so it's easy to build a new theme or add an existing ghost theme in HubPress