Those were in the rest of the crowd, although I can agree that they should be a very large part of the remaining audience, so you definitely have a good point - going by how the most vocal group which (in reddit etc) expresses favorable views about HotD are certainly rom fans.It's not that people can't "identity" that a plot was basic or hackneyed: after all, there are many, many romance novels that follow exactly the same structure and sell like hot cakes.
They are aided in this by people who really don't discern between basic and non-basic plots though.