What's right or wrong in Michael Huemer's critique of "The Objectivist Ethics"?

I found Professor Michael Huemer's essay "Critique of 'The Objectivist Ethics'" to be a very thoughtful and persuasive essay. It convinced me that Ayn Rand's ethics has a number of logical and possibly empirical flaws in it. Do you find any of his arguments valid? If, so which ones? Which ones do you think are wrong? Why? It this essay reason enough to reject Ayn Rand's meta-ethics?