Indeed, especially as the trains are formed of only a single 455. The same goes for the Kingston loop/Shepperton branch which is equally poorly served on Sundays, although there are additional Waterloo - Kingston via Richmond services on Sunday afternoons/evenings. I've never understood why Chessington and Hampton Court warrant a half hourly Sunday service, but Shepperton/Hounslow don't.
Does this have anything to do with palaces and worlds of adventure?