So far the casting is great and it seems like all the actors have a solid grasp of the source material. Lan and Moiraine stand out in particular.
I'm only on the second episode so I can't say much more but from the dialogue and portrayal of the Two Rivers village to the climactic battle scene in the first episode I'm pretty sold so far.
It was never really explored thoroughly because he died, but if you read the little of the background he left a well as some of the inferences in the novels it was clear he intended for there to be a female Dragon to be the counter point to Rand.