I always saw Daenerys Targaryen's plot to be a "cartoon", so to speak. Everything about her: from the dragons, to the royal bloodline, to the "slaves are bad Imma save everyone" plots was cartoonishly shallow. She's practically the "Dungeons and Dragons Murder Hobo Adventuring Party".

In effect, Daenerys was the "typical" fantasy plotline, happening elsewhere. Eventually, when Daenerys arrived on Westeros, where actual politics / actual history is going on (aka: more real), her fantasy methodologies just don't work out very well.

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But that's my reading (of the HBO series. I never actually read the books). I recognize that there are people out there who might think that the Dothraki were somehow realistic.