I watched MEDIUM this afternoon when I got in from lunch. I found it quite wonderful, and I liked it so much because for at least the first half hour, I couldn't tell where it was going, and I always love surprises like that.
Series television has by its nature to be rather repetitious, resorting to easy formulas due to the speed with which they must film the episodes, edit, score, and get them ready for airing.
MEDIUM, more than most series, has attempted to keep things always changing, always interesting so that you're never quite comfortable with how a story unfolds. Many episodes are not like previous ones, and I think this is one thing that sets it apart.