This is another show that has excellent writing and acting. I find the concept of one major case through the season to be a plus, not a minus. (The fact that some people have said that one storyline is too few says more about the attention span of the average viewer than the show). Again, it is a show that they messed around with the time slot and I hope they finally leave it where it is. The cast is very effective in fleshing out the characters.
Here's a link for you to ABC's Murder One Homepage