Isabella is just annoying. I find the whole idea of her strong powers, undefined good or bad personality and being a grown up after 2 years of life pretty interesting but her killing everyone around her to "help Shawn" is just really irritating. I was really rooting for Tom to make the injection and save us from more of such episodes.
Not a big fan of the drunk driver story. It was made to satisfy our public for whom punishment is more important than progress. But let's see if something interesting comes out of it.