Two recent shows stick out in my mind.
1) The Finder - A show about an off-beat detective who finds things. The cast of characters were excellent and diverse. The back stories were intriguing. Cancelling this show was a crime considering the stuff that's out there.
2) Friday Night Lights - A story about a texas high school football coach and his family. The cast was absolutely believable and the stories were well written. In many ways though, I was glad they ended this show. It lasted a perfect length of time and the stories within the show had a great mixture of positive and negative endings.