I am of the opinion meta description has less (if anything) to do with actual search engine result position and more more for conversions, ie to tempt the potential customer/user to click on your listing rather than other ones.
Obviously keywords are good, but that is incidental because they are the main point of the page and so not having them there would not be so good for clickthroughs from Google.
So if someone wants Cardiff City quizzes, having that in the description is not going to impress Google unless you actually have a quiz or quizzes on the page. But it will grab the people who actually find the site in the list and want a quiz.