I can't quite shake the conviction that Khal Drogo must at some point have been a member of System Of A Down...
Regarding epic battles and such, I think the great thing about GoT is that the sense of epicness comes from the scale of what's at stake - the throne of not just one kingdom, but seven! - and the massive complexity of the plot, as well as the incredibly brave/devious/cruel/mental things the characters are prepared to do to further their agenda, whatever it is. So massive battles, although cool to watch, are a bit redundant. It's not like TLOTR where it's all Colossal Army Of Absolute Good vs. Even Colossaler Army Of Absolute Evil.