Dr Clare Jackson of Cambridge University "argues that the Stuarts, more than any other, were Britain's defining royal family."

Um---
They were incompetent.
Their legitimacy ("His father was also called David and played on the harp") and sexuality were the constant source of public speculation
Large numbers of people hated them, to the extent that 2/7 of the dynasty were removed by revolutionary action over a period of less than half a century.
The most affectionate associations they have in the public mind concern dogs and racehorses.

Yanno, I can sort of see her argument.