The REST culture gives us some regularity. If we read github API, or google API or facebook API, we know what to expect - that they will use GET to retrieve an object, DELETE to delete an object and so on. It's good there is a convention helping to study new things.
Another good property of REST culture - it prevents people from building thick layers on top of HTTP. While not everything can fit into HTTP (at least error reporting, in my opinion; HTTP error codes are not enough), this culture helps to keep APIs simple.
Other than the verbs used, there isn't very much regularity. Try plugging a back end REST API into a front end framework. In my experience you always need an extra library.
