I can incorporate the fantasy aspects into the world easily.
But it just doesn't fit with how much political strategy is going around for everyone to be military eff-ups. It just seems like the show writers are lazy.
Euron is able to ambush two separate fleets on opposite sides of a continent? Westeros is at LEAST the size of California, it would take more than a few days to sail around Dorne, back up the Reach and up to the Westerlands at Casterly Rock. Come on.
Also, Dragonstone is pretty close to Kings Landing. How did they have no idea about Eurons gigantic fleet anchored off Kings Landing.