Right, that's why it was initially useful. Now that lots of people use the question, though, even mediocre developers will make sure to come to the interview with a list of criticisms of their favorite language.
"... even mediocre developers will make sure to come to the interview with a list of criticisms of their favorite language."
Which is fine if, when pressed, they can back up what they say. The question (like most good interview questions) is largely an excuse to help guide a conversation and some exploration to avoid canned responses.
