It was ages before I could bring myself to watch anymore after the plane crash, but when I did finally get around to starting season 3 I was really surprised at how light hearted they managed to make it. I suppose it helped that there weren't many people in the plane, though.
It seems a fair few fans don't like how Skylar's character changes, or manages to take on board Walt's secret, but I liked her a hell of a lot more after she found out. She's one of my favourite characters now.