David Bianculli

Right now, as we near the end of the 2012 fall TV premiere week, there's a tendency for a sense of weariness to set in. So many of the new TV series are so bad this year, and not one of them is outstanding. It tends to get a little depressing.

But then you think about the rich bounty of returning series, and how good television drama has gotten lately, and there's cause to rejoice all over again.

Last year, the broadcast networks didn't do well at all when it came to new series development. We got ABC's clever Once Upon a Time, which was about it for the fall crop, until midseason perked things up with NBC's Smash. Otherwise, a year ago, all the exciting new fall series were on cable, thanks to Showtime's brilliant Homeland and FX's audacious American Horror Story.

Johnny Carson walked away from The Tonight Show, after 30 years at the top of the late-night ratings, of his own volition. And except for a few fleeting TV appearances after he retired, he never looked back — and never went back. When filmmaker Peter Jones would send an annual letter to Carson, asking for his cooperation in a TV biography of him, the answer was always no. One year, Carson went so far as to explain why: Let the work, he said, speak for itself.