For a purely REST API, this might work, but for something like free-to-find services for which I need a quick-api solution to use, it just does not work. The API documentation editor (seriously, stop calling it documentation and call it specs instead) needs an advanced mode so I can use it better. Another thing I found missing was user help text on the apis themselves.
This might take off to become something like programmableweb, but developers won't rush to it with open-arms unless (a few) major api providers start using this.