The question is about games, so I don't see any argument that can be made that it is off-topic.
Is it a real question that deals with an actual problem someone is facing? That might be debatable.
Is it a clear and useful question? In my opinion, no. The term "flop" is never defined, it just gives some vague comparisons from a different genre. It basically seems to translate to "What game didn't live up to it's expectations the most?" That seems exceedingly vague to me, and even if there was a clear canonical example, it doesn't seem like knowing that example is going to provide any use to me as a gamer. If you feel the same, the appropriate response is a downvote, not a close vote.