Starting to worry about Dexter

I hope I'm wrong, but heavily hyped and alleged-best-thing-on-tv Dexter appears to be coasting along and we're only on episode three. Michael C Hall is still fabulous and his American Beauty-esque internal dialogue is still top-notch. But I'm tiring of his drippy girlfriend, the way his sister always outshines the top cop, the flashbacks to his childhood and the way Dexter somehow has a conscience despite being a killer. Most of all, I fear the ice-truck killer storyline is going to drag on for the entire series. Unless something shakes up the formula soon, I'm goins to be pretty dismayed. Perhaps I should look at some spoilers for clues, but I'm really trying to cut down on that sort of thing.