That's probably my least favourite part of the books, and what finally pushed me over the edge regarding Dany, from being rather indifferent to being a "hater". It's just so grating how everything else in the series seems to operate within very harsh realities, whereas Dany gets everything handed to her on a silver platter. While I was reading the Astapor scene, I totally saw it coming that she would use the Unsullied to attack the slavers, but the only thing that made me question it was that something so stupid couldn't possibly happen, but because it's Dany, of course it did.
I mean, the Astapori have been training the Unsullied for how long, centuries? And at no point did it occur to them when they trained them to obey every command that they however are under no circumstances to attack the Astapori? And then they just hand over the command of every single one of them to Dany, right inside the city walls? But hey, got to give Dany a huge army of brilliant soldiers who also have no chance of ever turning against her.
The whole Dany storyline basically makes me wish it's a giant build up for her to slowly descend into madness and become an, or perhaps even the, antagonist of Westeros. If the Others are the batshit insane Ice baddies, Dany can be the batshit insane Fire shill. Then she will be cut down by Barristan, who realizes that Jaime was right.