Used to be based there. Really out in the sticks and IIRC you could drive to Luxembourg City in the time it took to drive to Frankfurt. Still, nobody is forced to fly to these places so you can't blame Ryanair.
FWIW "Glasgow" Prestwick, "Stockholm" Skavsta and "Oslo" Torp are a fair distance from their city namesakes.
Oh, and "London" Oxford Airport is taking the p*ss. They're blantently just trying to steal buisness jet traffic from places like Biggin Hill.