No, I'm not, at all. The show has portrayed Daenerys in a very positive light, and she's in a very positive light because the people she's facing are pretty terrible. However, Daenerys, soon, will not be contrasted with these terrible people, she'll be in Westeros, where her enemies will include (but not be limited to):
Jon Snow
Sansa Stark
The Tyrells
The Lannisters
The Freys
The Boltons
The Iron Born (who aren't in Theon and Yara's group)
The Wildlings
Littlefinger
Dorne (?)
And anybody else who won't recognise her as the queen of Westeros, which is the vast majority of the cast). She's made it quite clear as to who and what she is, and that she intends to conquer the land with 'fire and blood', a path she committed to as she burned the Dothraki Khals alive. The lands she sacks? Now rife with Dothraki who, in traditional Dothraki fashion, will begin to plunder the dead and rape the survivors as we've already seen (and perhaps take slaves, at which point Daenerys is now also in conflict with Dothraki tradition). We've already seen Daenerys have followers who've witnessed what she's done and ignore her afterwards; we saw it when the Dothraki abandoned her in season two, we saw it in Qarth, and we've seen her unable to quell an uprising/rule the city effectively in Meereen. We've never seen Daenerys rule effectively, or been shown as a particularly competent ruler. She has a strong adviser in Tyrion (when it comes to politics), but not many otherwise. Nothing we've suggests the Dothraki will behave differently just because they're with Daenerys. And as Daenerys is the self-righteous type, she's not exactly going to be one to make compromises, take a democratic approach, or forgive those who act against her as we've seen when she crucified every Master regardless of the instability that would create in Meereen.
She is being portrayed as highly heroic, yes. She is also being portrayed as somebody who intends on conquering Westeros. She is somebody who literally burns her enemies alive. And she is somebody whose solution to trouble (Qarth Warlocks, witch in season one, Astapor Master, Masters, invading fleet, Dothraki Khals) throughout the show has always been through force (be that burning them alive, crucifying them, slitting their throats, or otherwise).