True. This always comes up whenever it gets posted here or on Reddit, so I just renamed it to the "Model S JSON API" to stop that argument from coming up again.
I use this API daily. I agree with some of the others. It works. I don't really care if it's REST or not.
Of course, if the API is going to be growing, you may want to organize it in a guessable format...also, if it's going to be growing, I wouldn't mind helping/testing. :D