Meritocracy is not a desirable state of affairs, because it should be obvious that "merit" is a false currency used to justify what is, rather than work toward what should be. It is the quintessential naturalistic fallacy. By definition, an is-ought fallacy such as Meritocracy can not be an ideal (if you misunderstand meritocracy to mean "everyone gets what they deserve" that cannot be an ideal either, as it would be no different from "a world ruled by God", which is an imagined state rather than an ideal).
It amazes me time and again how people can take the term seriously, which only demonstrates how dangerous it is. Such a blatant, perverted joke, a dystopia that some intelligent people mistake for a utopia. Wikipedia says this: "Although the concept has existed for centuries, the term "meritocracy" was first coined in the 1950s. It was used by British politician and sociologist, Michael Young in his 1958 satirical essay, The Rise of the Meritocracy, which pictured the United Kingdom under the rule of a government favouring intelligence and aptitude (merit) above all else... In this book the term had distinctly negative connotations as Young questioned both the legitimacy of the selection process used to become a member of this elite and the outcomes of being ruled by such a narrowly defined group."
I still can't fathom how meritocracy can be taken as anything but a negative. I mean, the first question that comes to mind (or, rather, the second after "what is merit") is, "who has merit and why, and who does not?" Once this question is asked, it is immediately apparent that any attempt to paint "meritocracy" in a positive light is ludicrous.