The expression of art and the appreciation of art are both inherently subjective. I don't mean to say this to let everyone off the hook... but I like what I like and others may like what they like.
I read the review by Christopher Farrell and I've come to the conclusion that his pleasure is my poison and vice versa.
I read the Thomas Covenant series when I was fourteen. In fact, I probably read around 100 fantasy/sci-fi books while I was fourteen and fifteen. It was all new to me and Donaldson's books were some of the first I read after Tolkien. I'd never read of an anti-hero like Covenant, but I was both intrigued and repulsed by him. I've never felt the urge to reread the series. And twenty-five years later, I do not look back on the series with fondness... in fact I remember a story painted in gross generalizations with a simplified story of a tragic savior against the ultimate evil, yada, yada, yada.
I've not read the specific story that Farrell mentioned, but if Donaldson's other work is similar to what I have read, count me out.
Farrell also compared ASOIAF to War and Peace. I confess I cannot read Russian, so if my reading of Tolstoy in English is inaccurate, I beg your forgiveness. I found the story tedious. I never identified with Pierre and Natasha (I think they ended up being the protagonists, iirc) at all. Natasha was hopelessly in over her head and Pierre was a moron. The assassination attempt on Napoleon was horribly written... Pierre's incompetence saves him?!?! Was he the hero or Inspector Clouseau? Clouseau was Socrates compared to Pierre.
I was not living in Russia two hundred years ago, but did people really act like that? Unrealistic portrayals of characters left me frustrated... I only finished it so that I could say "I've read War and Peace." I thought The Brothers Karamazov much more riveting and realistic.
But the comparison of scale is accurate. W&P and ASOIAF are both epics. Though, I find Westeros more realistic.
To me, ASOIAF is very comparable to Shogun by James Clavell. Both are epic stories in feudal kingdoms. Both tell their story's by different POVs. The reader enjoys the insights into the characters motivations and thought processes, not just actions. Both are full of intrigue, subterfuge, love, lust, murder, catastrophe, survival and triumph. Just like Martin starts off with the Stark POVs painting terrible pictures of the Lannister brothers, Clavell starts off with Blackthorne's POV condenming the scheming Catholic Church, Spanish greed and Japansese barbarity. Then Martin starts giving Tyrion's and Jaime's perspectives on issues and events... and Clavell starts giving his readers the perspectives of Mariko, Alvito, Yabu, Omi, and Toranaga... and by the end Toranaga was my favorite character. If you read Samurai William by Giles Milton, you'll find that Shogun is almost as fictional as ASOIAF.
And concerning his critics, Tolkien once wrote, "Some who have read the book, or at any rate have reviewed it, have found it boring, absurd, or contemptible; and I have no cause to complain, since I have similar opinions of their works, or of the kinds of writing that they evidently prefer."