In terms of the way that both Jordan and Martin let the story get away from them, he's right. In terms of the world being a character, he's wrong. In both cases, too many subplots were added (something he actually highlights). It's not so much that the world of either author is filled with any level of real depth (they all seem like bad copies of real world cultures superimposed on a fake map, frequently blending in with one another into a mix of...blah).
I also agree that Mistborn was a great trilogy for its genre because it was not derivative or predictable. The people who criticize Sanderson as not being a good writer are just ignoring the fact that Jordan and Martin weren't good writers, either. Good storytellers (prior to Book 8 for Jordan, or Book 4 for Martin), certainly, but not good writers. I also think that Wheel of Time's ending wasn't particularly good.
ἡ δὲ κἀκ τριῶν τρυπημάτων ἐργαζομένη ἐνεκάλει τῇ φύσει, δυσφορουμένη, ὅτι δὴ μὴ καὶ τοὺς τιτθοὺς αὐτῇ εὐρύτερον ἢ νῦν εἰσι τρυπώη, ὅπως καὶ ἄλλην ἐνταῦθα μίξιν ἐπιτεχνᾶσθαι δυνατὴ εἴη. – Procopius
Ummaka qinnassa nīk!
*MySmiley*
