Vince Gilligan really wasn't kidding when he said he didn't know where he was going with this show. I can wait, though, if the quality of the show remains the same, perhaps it'll even get better.
On the whole, I thought that season 3 was better than season 2. More action, more WTF moments, and I think the best characterization of each of our anti-heroes. The Cousins were great (while they lasted) and an unexpected villain arose in Gus, who I thought would be Walt's ally at the outset of his development. The character I least expected to be the most interesting in season 4, Jesse, is the one I am looking forward to getting back to now but I'll have to wait more than a year it seems...