I liked it. Could have done without the fat jokes, but I they did the literary analysis well.
The two central arguments for me ended in draws.
Realistic and surprising fantasy vs predictable high fantasy – I initially thought Martin should have that argument in the bag, but then Tolkien came back stating that the realism of life doesn’t matter in FANTASY! Burn!
Then there was the prose question. Granted, Martin’s writing is more efficient, simple and modern whereas Tolkien’s is a little exuberant in its archaic imitations. To each their own, I’d say. Everyone seems to have their own idea on what good writing is.
All in all, a good ERB, but they could have done it a little more gentlemanly. The yelling and aggressive face-making isn’t necessary. See for example Jobs vs Gates.