This story didn't do much for me, and as with many Hugo nominees, left me thinking "This was really a Hugo nominee?" My faith is somewhat restored when the Hugo nominees that blow my mind tend to be the ones that win.
Barnaby in Exile did the intelligent ape plot better, and I liked that one so much that this one really hurts from the comparison. It was an interesting opening scene, with two interesting characters, but then it just ends without warning.
And the title was just terrible. I'd been looking forward to listening to Evil Robot Monkey ever since I downloaded the whole EP archive and did a quick flip through the titles. With a title like that, it doesn't take much to satisfy me, just a story with an evil robot monkey. I would've forgiven all kinds of faults as long as it delivered on it's promise. But this story had no evil, no robot, and no monkey. Very disappointing. If it had been given a title that actually described the story, instead of just a one-liner from a moronic secondary character, then I think I would've liked it quite a bit more.