Fourth episode feels like they're starting to really settle in. In the first episode, Moiraine drawing the Power looked a little cheesy, but since they're sticking with that visual all the way through, you kind of get used to it. And the battle scene started to really showcase what they can do.
I particularly thought it was effective that (book spoiler)...
At this point, I'm relatively confident that this will be good enough to satisfy book readers. Now the only question is to what extent they'll be able to draw in the masses.