I don't really hate any pinball machine, but games that I think are way overrated:
Circus Voltaire, very pretty, boring play
White Water, never figured that one out
Game of Thrones, boring repetitive game play
Flash Gordon, split playfield with both fields lame and uninspired. Never understood what people see in this game. One of the worst layout in the history of pinball.
Those 4 are the most overrated in my book.