I thought episode 4, "Fifty One," was great. I've almost done a 180 on hating Skyler's character. She does have a point -- just at the end of last season, Walter thought a man was coming to kill the whole family. From her perspective, he's proven that he doesn't have a handle on the situation. Flinging herself in the pool I'll admit was weird and overly dramatic, but her motivation makes sense. She wants to protect her kids from whatever happens next with Walter.
And Walter is being insanely greedy at this point, far beyond any actual needs. At the beginning, he wanted to make money to leave behind for his family. He had clear and present needs. Now, he's buying cars he doesn't need, and pressing an unreliable methylamine contact. He has no regard for Skyler's mental health and he clearly views her as the enemy now ("my children," "your plan," etc), which is a departure from season 1.
Of course I'm still rooting for Walter and the whole gang, particularly Mike, but so far it seems like the point of this season is how Walter is losing touch with his original reasons for doing things.
Great season so far. It's been quite a ride, QUITE A RIDE!