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I wouldnt call it broken but it's definitely one of the best types in the game.
Like take for example Clefable, in Gen 5 it was a really obscure RU mon, but with the adition of Fairy it literally became god.
The good thing is that there arent a lot of fairy types and most of them have shit stats/are outclassed by Clefable so I think Gamefreak did manage the type well at not making it broken.