Things to be missed:

-The random appearances of CBI Ron.
-Cho and Risgby's conversations.
-Van Pelt.
-The sudden face on the wall we watched at several crime scenes and Brett Partridge analyzing the scene.
-Bob Kirkland.
-Lisbon always confronting Jane instead of agreeing with him.
-This darkness and sadness in Jane's personality.Not a happy hippie.
-Jane solving weekly crimes in a fascinating way.Not running away from the FBI...
-Red John. (of course)
-Episodes involving Visualise.And Bret Stiles.
-Cho's more screen time.
-Lorelei Martins.
-Red John background music.
-Jane's teacup.