At first I was pretty dissappointed, but after rewatching it and thinking about it, I believe it was a good ending. I am sure the loose ends will be tied up in future episodes.

The patheticness of Red John as he died at the hands of Jane is a beautiful example of how sad some "evil" people are. Egotistical, and wimpy when confronted while they aren't in control.

If this really isn't the end, I'll be surprised.