The problem with Game of Thrones' ending isn't that it's bad per se but that it skips several important steps along the way; it's basically this
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Specifically in Dany's case, it was known that 'the gods toss a coin whenever a Targeryan is born', it was shown that she completely rigid in her beliefs and could not accept alternate views and it was demonstrated that she had an over inflated sense of entitlement. All these things made the ending inevitable but also played out like ST Into Darkness doing Khan without redoing Space Seed or Snyder doing Death of Superman without bothering to show the life of Superman