I dunno, I haven't really had trouble understanding any of it so far, seems pretty straightforward. I'll probably read the books at some point, but I'm not in a hurry, I've managed to live without them so far. I have enough shit on my reading list.
Also, I dig the main theme. Epic strings and drums.
Probably after watching the last episode of this season you'll want to know how it continues too much so you'll start reading.
Other than that good to hear that you enjoyed it without knowning the books, its very hard to imagine how it would be without having read everything before.
the good thing is that the main theme is (or still seems to be epic) but the smaller ones are epic in its own ways. I'm very curious how good theyll catch the deeper layers of many characters for example Jaime, Cersei or the Hound. And I'm very curous how Littlefinger will appear in the show. The actor of "Tommy Carcetti" was one of my favourites in "The Wire" and I imagine he fits perfectly into the role of Petyr Baelish.