I think the Lord of the Rings and The Hobbit are fine books. I'd argue that's the only fantasy worth reading, with a marginal exception for Terry Pratchett. I haven't regretted buying R.R.Martin's books, but they are still fairly badly written. I can enjoy the characters I empathized with in the show, and I can appreciate the sense of amoral political intrigue the plot creates, but it's still clumsy, mechanical and poorly suited for prose, really. He's part of a type of writer that, as far as I know, first appeared in the US and who seem to be writing movie plots instead of books. Clancy, Grisham are famous examples, but this class of writer has spread across the world. There's a Portuguese news anchor who writes books in the same style, for example.
To me, if you're going to compare his works to Eddings or Goodkind, in order to somehow elevate his standing, you might as well put his books side by side with slash fan fiction.