They’re terrible. Who are we kidding, no one has backed out of the website after seeing one of these notices.
They don't state it clearly, but every cookie means: "By accepting this cookie you agree to be tracked on the Internet, and allow that data to be sold."
(or, "We don't really understand cookie-law, and we didn't actually need to put this up".)
Once you know that, it's easier to ask yourself: "Do I really need to read this? Also given that it's likely a sub-par publication, because tracking usually implies layouts and techniques optimised to keep you on the site and optimise data collection."