Haven't watched the new ep yet but as with others. The Red John thing got boring a hell of a long time ago. There is only so much Red John is the smartest man in the universe ever and can do absolutely anything he wants at any time before it becomes a complete joke. Should have had Josh from West wing lead straight into identifying Red John then spending a season or two max actually tracking down a known target. What they've done instead is made the show a bit poo.
Too often these shows have a major premise, but they take the major story arc to be the only possible story arc and stretch it. Could have caught Red john 4 years ago, and I dunno, had a new story line
Taking down the corrupt officials would have been good, you can't just have one guy be so utterly invisible for so long then have him caught. It's getting into Lost territory of ridiculousness in how they go from one stage to the next.
What they missed, why the show was good was it was a good detective show with an underlying arc, but the detective show part was the strength, not the red john story line. But they've focused the show on the latter, with ever weaker stories, ever weaker less involved cases.
Good cast, some great early seasons, but been a waste of time for 2 + years.