SPOILERS ABOUT A SONG OF ICE AND FIRE!
Edi,
What happens on the wedding night between Khal Drogo and Daenyrys is important to the story. Though Daenyrys is forced to marry him, she comes to love him and accepts her part as Drogo's wife. Everything that follows is built on that.
Also, she is not a preteen, so your pedophile remark is not accurate. Modern laws about age of consent are just that, modern.
Likewise, descriptions of brutality done by soldiers of the warring Houses are important. Writing about war and passing by the ugly parts is very common, and as I said before, the fact that Martin doesn't do so speaks in his favor.
I can understand that one can be repulsed by such things, but that is quite a separate issue from whether or not the books are good. Not that I'm denying your right to an opinion, but like you, I like to explain my point of view.
SPOILER END