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As for the drawbacks, there's an excessive amount of complexity... No, a large number of nuances and features is great, but the complex relationships between roles are unnecessary. And not only because they make it harder to understand the setting (they make it much harder), but also because the likelihood of them actually having a real impact on the game is small. And even if the Goblin manages to steal the crown and so on, it will only be a cause of imbalance in the game: it's impossible to predict in advance whether this will happen or not, the probability is low.
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Although, maybe I'm wrong now... I just didn't quite understand what's going on with the crown.